Finding the Fourth Proportional to 56,578.18, 78,077.94 and 31,086.19

Step by Step Solution

1. Step 1: Write the proportion equation
   56,578.18 : 78,077.94 = 31,086.19 : x
2. Step 2: Convert to fraction form
   56,578.18/78,077.94 = 31,086.19/x
3. Step 3: Cross multiply
   56,578.18x = 78,077.94 × 31,086.19
4. Step 4: Simplify right side
   56,578.18x = 2,427,145,677.65
5. Step 5: Solve for x
   x = 2,427,145,677.65/56,578.18
6. Step 6: Final answer
   x = 42,898.97