Finding the Fourth Proportional to 139,137,233,796.20, 208,814,689,811.10 and 64,616,451,012.20

Step by Step Solution

1. Step 1: Write the proportion equation
   139,137,233,796.20 : 208,814,689,811.10 = 64,616,451,012.20 : x
2. Step 2: Convert to fraction form
   139,137,233,796.20/208,814,689,811.10 = 64,616,451,012.20/x
3. Step 3: Cross multiply
   139,137,233,796.20x = 208,814,689,811.10 × 64,616,451,012.20
4. Step 4: Simplify right side
   139,137,233,796.20x = 13,492,864,174,806,680,993,792
5. Step 5: Solve for x
   x = 13,492,864,174,806,680,993,792/139,137,233,796.20
6. Step 6: Final answer
   x = 96,975,222,279.97