Finding the Fourth Proportional to 1,542.50, 2,128.59 and 879.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,542.50 : 2,128.59 = 879.22 : x
2. Step 2: Convert to fraction form
   1,542.50/2,128.59 = 879.22/x
3. Step 3: Cross multiply
   1,542.50x = 2,128.59 × 879.22
4. Step 4: Simplify right side
   1,542.50x = 1,871,507.29
5. Step 5: Solve for x
   x = 1,871,507.29/1,542.50
6. Step 6: Final answer
   x = 1,213.30