Finding the Fourth Proportional to 31,105, 42,940.22 and 21,552.13

Step by Step Solution

1. Step 1: Write the proportion equation
   31,105 : 42,940.22 = 21,552.13 : x
2. Step 2: Convert to fraction form
   31,105/42,940.22 = 21,552.13/x
3. Step 3: Cross multiply
   31,105x = 42,940.22 × 21,552.13
4. Step 4: Simplify right side
   31,105x = 925,453,203.67
5. Step 5: Solve for x
   x = 925,453,203.67/31,105
6. Step 6: Final answer
   x = 29,752.55