Finding the Fourth Proportional to 56,578.43, 78,078.45 and 31,086.86

Step by Step Solution

1. Step 1: Write the proportion equation
   56,578.43 : 78,078.45 = 31,086.86 : x
2. Step 2: Convert to fraction form
   56,578.43/78,078.45 = 31,086.86/x
3. Step 3: Cross multiply
   56,578.43x = 78,078.45 × 31,086.86
4. Step 4: Simplify right side
   56,578.43x = 2,427,213,844.17
5. Step 5: Solve for x
   x = 2,427,213,844.17/56,578.43
6. Step 6: Final answer
   x = 42,899.99