Finding the Fourth Proportional to 432,978.72, 649,354.28 and 129,300.81

Step by Step Solution

1. Step 1: Write the proportion equation
   432,978.72 : 649,354.28 = 129,300.81 : x
2. Step 2: Convert to fraction form
   432,978.72/649,354.28 = 129,300.81/x
3. Step 3: Cross multiply
   432,978.72x = 649,354.28 × 129,300.81
4. Step 4: Simplify right side
   432,978.72x = 83,962,033,734.46
5. Step 5: Solve for x
   x = 83,962,033,734.46/432,978.72
6. Step 6: Final answer
   x = 193,917.23