Finding the Fourth Proportional to 31,139.11, 42,958.88 and 21,713.14

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.11 : 42,958.88 = 21,713.14 : x
2. Step 2: Convert to fraction form
   31,139.11/42,958.88 = 21,713.14/x
3. Step 3: Cross multiply
   31,139.11x = 42,958.88 × 21,713.14
4. Step 4: Simplify right side
   31,139.11x = 932,771,959.72
5. Step 5: Solve for x
   x = 932,771,959.72/31,139.11
6. Step 6: Final answer
   x = 29,955.00