Finding the Fourth Proportional to 139,003.25, 208,506.70 and 45,509

Step by Step Solution

1. Step 1: Write the proportion equation
   139,003.25 : 208,506.70 = 45,509 : x
2. Step 2: Convert to fraction form
   139,003.25/208,506.70 = 45,509/x
3. Step 3: Cross multiply
   139,003.25x = 208,506.70 × 45,509
4. Step 4: Simplify right side
   139,003.25x = 9,488,931,410.30
5. Step 5: Solve for x
   x = 9,488,931,410.30/139,003.25
6. Step 6: Final answer
   x = 68,264.10