Finding the Fourth Proportional to 31,042.62, 42,836.31 and 21,631.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,042.62 : 42,836.31 = 21,631.50 : x
2. Step 2: Convert to fraction form
   31,042.62/42,836.31 = 21,631.50/x
3. Step 3: Cross multiply
   31,042.62x = 42,836.31 × 21,631.50
4. Step 4: Simplify right side
   31,042.62x = 926,613,639.77
5. Step 5: Solve for x
   x = 926,613,639.77/31,042.62
6. Step 6: Final answer
   x = 29,849.72