Finding the Fourth Proportional to 619,817,507.28, 855,320,562.72 and 355,309,868.88

Step by Step Solution

1. Step 1: Write the proportion equation
   619,817,507.28 : 855,320,562.72 = 355,309,868.88 : x
2. Step 2: Convert to fraction form
   619,817,507.28/855,320,562.72 = 355,309,868.88/x
3. Step 3: Cross multiply
   619,817,507.28x = 855,320,562.72 × 355,309,868.88
4. Step 4: Simplify right side
   619,817,507.28x = 303,903,836,990,411,008
5. Step 5: Solve for x
   x = 303,903,836,990,411,008/619,817,507.28
6. Step 6: Final answer
   x = 490,311,798.91