Finding the Fourth Proportional to 553,777.31, 764,213.00 and 299,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   553,777.31 : 764,213.00 = 299,128.50 : x
2. Step 2: Convert to fraction form
   553,777.31/764,213.00 = 299,128.50/x
3. Step 3: Cross multiply
   553,777.31x = 764,213.00 × 299,128.50
4. Step 4: Simplify right side
   553,777.31x = 228,597,886,874.86
5. Step 5: Solve for x
   x = 228,597,886,874.86/553,777.31
6. Step 6: Final answer
   x = 412,797.49