Finding the Fourth Proportional to 31,108.50, 42,929.73 and 19,931.22

Step by Step Solution

1. Step 1: Write the proportion equation
   31,108.50 : 42,929.73 = 19,931.22 : x
2. Step 2: Convert to fraction form
   31,108.50/42,929.73 = 19,931.22/x
3. Step 3: Cross multiply
   31,108.50x = 42,929.73 × 19,931.22
4. Step 4: Simplify right side
   31,108.50x = 855,641,893.17
5. Step 5: Solve for x
   x = 855,641,893.17/31,108.50
6. Step 6: Final answer
   x = 27,505.08