Finding the Fourth Proportional to 31,113.47, 46,642.17 and 21,121.61

Step by Step Solution

1. Step 1: Write the proportion equation
   31,113.47 : 46,642.17 = 21,121.61 : x
2. Step 2: Convert to fraction form
   31,113.47/46,642.17 = 21,121.61/x
3. Step 3: Cross multiply
   31,113.47x = 46,642.17 × 21,121.61
4. Step 4: Simplify right side
   31,113.47x = 985,157,724.29
5. Step 5: Solve for x
   x = 985,157,724.29/31,113.47
6. Step 6: Final answer
   x = 31,663.39