Finding the Fourth Proportional to 432,978.47, 649,353.90 and 129,300.56

Step by Step Solution

1. Step 1: Write the proportion equation
   432,978.47 : 649,353.90 = 129,300.56 : x
2. Step 2: Convert to fraction form
   432,978.47/649,353.90 = 129,300.56/x
3. Step 3: Cross multiply
   432,978.47x = 649,353.90 × 129,300.56
4. Step 4: Simplify right side
   432,978.47x = 83,961,822,908.18
5. Step 5: Solve for x
   x = 83,961,822,908.18/432,978.47
6. Step 6: Final answer
   x = 193,916.85