Finding the Fourth Proportional to 643,499.94, 888,108.71 and 371,567.15

Step by Step Solution

1. Step 1: Write the proportion equation
   643,499.94 : 888,108.71 = 371,567.15 : x
2. Step 2: Convert to fraction form
   643,499.94/888,108.71 = 371,567.15/x
3. Step 3: Cross multiply
   643,499.94x = 888,108.71 × 371,567.15
4. Step 4: Simplify right side
   643,499.94x = 329,992,019,296.91
5. Step 5: Solve for x
   x = 329,992,019,296.91/643,499.94
6. Step 6: Final answer
   x = 512,808.16