Finding the Fourth Proportional to 413,487.72, 620,154.69 and 129,185.25

Step by Step Solution

1. Step 1: Write the proportion equation
   413,487.72 : 620,154.69 = 129,185.25 : x
2. Step 2: Convert to fraction form
   413,487.72/620,154.69 = 129,185.25/x
3. Step 3: Cross multiply
   413,487.72x = 620,154.69 × 129,185.25
4. Step 4: Simplify right side
   413,487.72x = 80,114,838,666.32
5. Step 5: Solve for x
   x = 80,114,838,666.32/413,487.72
6. Step 6: Final answer
   x = 193,753.85