Finding the Fourth Proportional to 1,540, 2,124.20 and 1,036.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,540 : 2,124.20 = 1,036.72 : x
2. Step 2: Convert to fraction form
   1,540/2,124.20 = 1,036.72/x
3. Step 3: Cross multiply
   1,540x = 2,124.20 × 1,036.72
4. Step 4: Simplify right side
   1,540x = 2,202,200.62
5. Step 5: Solve for x
   x = 2,202,200.62/1,540
6. Step 6: Final answer
   x = 1,430.00