Finding the Fourth Proportional to 643,410, 887,774.04 and 356,868.72

Step by Step Solution

1. Step 1: Write the proportion equation
   643,410 : 887,774.04 = 356,868.72 : x
2. Step 2: Convert to fraction form
   643,410/887,774.04 = 356,868.72/x
3. Step 3: Cross multiply
   643,410x = 887,774.04 × 356,868.72
4. Step 4: Simplify right side
   643,410x = 316,818,785,304.03
5. Step 5: Solve for x
   x = 316,818,785,304.03/643,410
6. Step 6: Final answer
   x = 492,405.75