Finding the Fourth Proportional to 1,542.52, 2,128.88 and 879.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,542.52 : 2,128.88 = 879.61 : x
2. Step 2: Convert to fraction form
   1,542.52/2,128.88 = 879.61/x
3. Step 3: Cross multiply
   1,542.52x = 2,128.88 × 879.61
4. Step 4: Simplify right side
   1,542.52x = 1,872,584.14
5. Step 5: Solve for x
   x = 1,872,584.14/1,542.52
6. Step 6: Final answer
   x = 1,213.98