Finding the Fourth Proportional to 1,543.04, 2,128.86 and 879.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,543.04 : 2,128.86 = 879.72 : x
2. Step 2: Convert to fraction form
   1,543.04/2,128.86 = 879.72/x
3. Step 3: Cross multiply
   1,543.04x = 2,128.86 × 879.72
4. Step 4: Simplify right side
   1,543.04x = 1,872,800.72
5. Step 5: Solve for x
   x = 1,872,800.72/1,543.04
6. Step 6: Final answer
   x = 1,213.71