Finding the Fourth Proportional to 31,128.50, 42,957.33 and 19,950.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.50 : 42,957.33 = 19,950.50 : x
2. Step 2: Convert to fraction form
   31,128.50/42,957.33 = 19,950.50/x
3. Step 3: Cross multiply
   31,128.50x = 42,957.33 × 19,950.50
4. Step 4: Simplify right side
   31,128.50x = 857,020,212.17
5. Step 5: Solve for x
   x = 857,020,212.17/31,128.50
6. Step 6: Final answer
   x = 27,531.69