Finding the Fourth Proportional to 31,137.11, 42,978.36 and 17,715.86

Step by Step Solution

1. Step 1: Write the proportion equation
   31,137.11 : 42,978.36 = 17,715.86 : x
2. Step 2: Convert to fraction form
   31,137.11/42,978.36 = 17,715.86/x
3. Step 3: Cross multiply
   31,137.11x = 42,978.36 × 17,715.86
4. Step 4: Simplify right side
   31,137.11x = 761,398,393.90
5. Step 5: Solve for x
   x = 761,398,393.90/31,137.11
6. Step 6: Final answer
   x = 24,453.09