Finding the Fourth Proportional to 56,616.36, 78,131.56 and 31,123.80

Step by Step Solution

1. Step 1: Write the proportion equation
   56,616.36 : 78,131.56 = 31,123.80 : x
2. Step 2: Convert to fraction form
   56,616.36/78,131.56 = 31,123.80/x
3. Step 3: Cross multiply
   56,616.36x = 78,131.56 × 31,123.80
4. Step 4: Simplify right side
   56,616.36x = 2,431,751,047.13
5. Step 5: Solve for x
   x = 2,431,751,047.13/56,616.36
6. Step 6: Final answer
   x = 42,951.38