Finding the Fourth Proportional to 31,643.91, 43,658.73 and 21,035.34

Step by Step Solution

1. Step 1: Write the proportion equation
   31,643.91 : 43,658.73 = 21,035.34 : x
2. Step 2: Convert to fraction form
   31,643.91/43,658.73 = 21,035.34/x
3. Step 3: Cross multiply
   31,643.91x = 43,658.73 × 21,035.34
4. Step 4: Simplify right side
   31,643.91x = 918,376,229.52
5. Step 5: Solve for x
   x = 918,376,229.52/31,643.91
6. Step 6: Final answer
   x = 29,022.21