Finding the Fourth Proportional to 139,116.88, 208,705.56 and 45,619.12

Step by Step Solution

1. Step 1: Write the proportion equation
   139,116.88 : 208,705.56 = 45,619.12 : x
2. Step 2: Convert to fraction form
   139,116.88/208,705.56 = 45,619.12/x
3. Step 3: Cross multiply
   139,116.88x = 208,705.56 × 45,619.12
4. Step 4: Simplify right side
   139,116.88x = 9,520,963,986.31
5. Step 5: Solve for x
   x = 9,520,963,986.31/139,116.88
6. Step 6: Final answer
   x = 68,438.60