Finding the Fourth Proportional to 642,490.28, 963,548.00 and 215,977.89

Step by Step Solution

1. Step 1: Write the proportion equation
   642,490.28 : 963,548.00 = 215,977.89 : x
2. Step 2: Convert to fraction form
   642,490.28/963,548.00 = 215,977.89/x
3. Step 3: Cross multiply
   642,490.28x = 963,548.00 × 215,977.89
4. Step 4: Simplify right side
   642,490.28x = 208,105,062,873.83
5. Step 5: Solve for x
   x = 208,105,062,873.83/642,490.28
6. Step 6: Final answer
   x = 323,903.83