Finding the Fourth Proportional to 31,691.47, 43,726.83 and 21,640.84

Step by Step Solution

1. Step 1: Write the proportion equation
   31,691.47 : 43,726.83 = 21,640.84 : x
2. Step 2: Convert to fraction form
   31,691.47/43,726.83 = 21,640.84/x
3. Step 3: Cross multiply
   31,691.47x = 43,726.83 × 21,640.84
4. Step 4: Simplify right side
   31,691.47x = 946,285,113.10
5. Step 5: Solve for x
   x = 946,285,113.10/31,691.47
6. Step 6: Final answer
   x = 29,859.30