Finding the Fourth Proportional to 31,140.05, 42,960.17 and 21,714.08

Step by Step Solution

1. Step 1: Write the proportion equation
   31,140.05 : 42,960.17 = 21,714.08 : x
2. Step 2: Convert to fraction form
   31,140.05/42,960.17 = 21,714.08/x
3. Step 3: Cross multiply
   31,140.05x = 42,960.17 × 21,714.08
4. Step 4: Simplify right side
   31,140.05x = 932,840,407.68
5. Step 5: Solve for x
   x = 932,840,407.68/31,140.05
6. Step 6: Final answer
   x = 29,956.30