Finding the Fourth Proportional to 56,615.38, 78,127.54 and 31,121.72

Step by Step Solution

1. Step 1: Write the proportion equation
   56,615.38 : 78,127.54 = 31,121.72 : x
2. Step 2: Convert to fraction form
   56,615.38/78,127.54 = 31,121.72/x
3. Step 3: Cross multiply
   56,615.38x = 78,127.54 × 31,121.72
4. Step 4: Simplify right side
   56,615.38x = 2,431,463,424.17
5. Step 5: Solve for x
   x = 2,431,463,424.17/56,615.38
6. Step 6: Final answer
   x = 42,947.05