Finding the Fourth Proportional to 858,131.82, 1,287,155.91 and 318,493.14

Step by Step Solution

1. Step 1: Write the proportion equation
   858,131.82 : 1,287,155.91 = 318,493.14 : x
2. Step 2: Convert to fraction form
   858,131.82/1,287,155.91 = 318,493.14/x
3. Step 3: Cross multiply
   858,131.82x = 1,287,155.91 × 318,493.14
4. Step 4: Simplify right side
   858,131.82x = 409,950,327,445.46
5. Step 5: Solve for x
   x = 409,950,327,445.46/858,131.82
6. Step 6: Final answer
   x = 477,724.19