Finding the Fourth Proportional to 56,111.81, 77,432.15 and 30,961.31

Step by Step Solution

1. Step 1: Write the proportion equation
   56,111.81 : 77,432.15 = 30,961.31 : x
2. Step 2: Convert to fraction form
   56,111.81/77,432.15 = 30,961.31/x
3. Step 3: Cross multiply
   56,111.81x = 77,432.15 × 30,961.31
4. Step 4: Simplify right side
   56,111.81x = 2,397,400,490.36
5. Step 5: Solve for x
   x = 2,397,400,490.36/56,111.81
6. Step 6: Final answer
   x = 42,725.42