Finding the Fourth Proportional to 31,139.14, 42,972 and 16,992.10

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.14 : 42,972 = 16,992.10 : x
2. Step 2: Convert to fraction form
   31,139.14/42,972 = 16,992.10/x
3. Step 3: Cross multiply
   31,139.14x = 42,972 × 16,992.10
4. Step 4: Simplify right side
   31,139.14x = 730,184,521.20
5. Step 5: Solve for x
   x = 730,184,521.20/31,139.14
6. Step 6: Final answer
   x = 23,449.09