Finding the Fourth Proportional to 31,139.95, 42,972.91 and 16,992.49

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.95 : 42,972.91 = 16,992.49 : x
2. Step 2: Convert to fraction form
   31,139.95/42,972.91 = 16,992.49/x
3. Step 3: Cross multiply
   31,139.95x = 42,972.91 × 16,992.49
4. Step 4: Simplify right side
   31,139.95x = 730,216,743.45
5. Step 5: Solve for x
   x = 730,216,743.45/31,139.95
6. Step 6: Final answer
   x = 23,449.52