Finding the Fourth Proportional to 1,543.52, 2,128.71 and 1,072.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,543.52 : 2,128.71 = 1,072.20 : x
2. Step 2: Convert to fraction form
   1,543.52/2,128.71 = 1,072.20/x
3. Step 3: Cross multiply
   1,543.52x = 2,128.71 × 1,072.20
4. Step 4: Simplify right side
   1,543.52x = 2,282,402.89
5. Step 5: Solve for x
   x = 2,282,402.89/1,543.52
6. Step 6: Final answer
   x = 1,478.70