Finding the Fourth Proportional to 31,139.99, 42,960.09 and 21,714.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.99 : 42,960.09 = 21,714.02 : x
2. Step 2: Convert to fraction form
   31,139.99/42,960.09 = 21,714.02/x
3. Step 3: Cross multiply
   31,139.99x = 42,960.09 × 21,714.02
4. Step 4: Simplify right side
   31,139.99x = 932,835,930.09
5. Step 5: Solve for x
   x = 932,835,930.09/31,139.99
6. Step 6: Final answer
   x = 29,956.21