Finding the Fourth Proportional to 1,543.05, 2,128.88 and 879.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,543.05 : 2,128.88 = 879.43 : x
2. Step 2: Convert to fraction form
   1,543.05/2,128.88 = 879.43/x
3. Step 3: Cross multiply
   1,543.05x = 2,128.88 × 879.43
4. Step 4: Simplify right side
   1,543.05x = 1,872,200.94
5. Step 5: Solve for x
   x = 1,872,200.94/1,543.05
6. Step 6: Final answer
   x = 1,213.31