Finding the Fourth Proportional to 1,545.28, 2,131.72 and 1,434.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,545.28 : 2,131.72 = 1,434.11 : x
2. Step 2: Convert to fraction form
   1,545.28/2,131.72 = 1,434.11/x
3. Step 3: Cross multiply
   1,545.28x = 2,131.72 × 1,434.11
4. Step 4: Simplify right side
   1,545.28x = 3,057,106.73
5. Step 5: Solve for x
   x = 3,057,106.73/1,545.28
6. Step 6: Final answer
   x = 1,978.35