Finding the Fourth Proportional to 56,291.76, 77,677.92 and 31,140.72

Step by Step Solution

1. Step 1: Write the proportion equation
   56,291.76 : 77,677.92 = 31,140.72 : x
2. Step 2: Convert to fraction form
   56,291.76/77,677.92 = 31,140.72/x
3. Step 3: Cross multiply
   56,291.76x = 77,677.92 × 31,140.72
4. Step 4: Simplify right side
   56,291.76x = 2,418,946,356.90
5. Step 5: Solve for x
   x = 2,418,946,356.90/56,291.76
6. Step 6: Final answer
   x = 42,971.59