Finding the Fourth Proportional to 31,108.26, 42,915.83 and 21,033.12

Step by Step Solution

1. Step 1: Write the proportion equation
   31,108.26 : 42,915.83 = 21,033.12 : x
2. Step 2: Convert to fraction form
   31,108.26/42,915.83 = 21,033.12/x
3. Step 3: Cross multiply
   31,108.26x = 42,915.83 × 21,033.12
4. Step 4: Simplify right side
   31,108.26x = 902,653,697.12
5. Step 5: Solve for x
   x = 902,653,697.12/31,108.26
6. Step 6: Final answer
   x = 29,016.53