Finding the Fourth Proportional to 31,116.07, 42,939.26 and 17,688.79

Step by Step Solution

1. Step 1: Write the proportion equation
   31,116.07 : 42,939.26 = 17,688.79 : x
2. Step 2: Convert to fraction form
   31,116.07/42,939.26 = 17,688.79/x
3. Step 3: Cross multiply
   31,116.07x = 42,939.26 × 17,688.79
4. Step 4: Simplify right side
   31,116.07x = 759,543,464.45
5. Step 5: Solve for x
   x = 759,543,464.45/31,116.07
6. Step 6: Final answer
   x = 24,410.01