Finding the Fourth Proportional to 1,543.71, 2,129.59 and 1,123.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,543.71 : 2,129.59 = 1,123.88 : x
2. Step 2: Convert to fraction form
   1,543.71/2,129.59 = 1,123.88/x
3. Step 3: Cross multiply
   1,543.71x = 2,129.59 × 1,123.88
4. Step 4: Simplify right side
   1,543.71x = 2,393,394.37
5. Step 5: Solve for x
   x = 2,393,394.37/1,543.71
6. Step 6: Final answer
   x = 1,550.42