Finding the Fourth Proportional to 1,561.20, 2,154.56 and 1,036.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.20 : 2,154.56 = 1,036.88 : x
2. Step 2: Convert to fraction form
   1,561.20/2,154.56 = 1,036.88/x
3. Step 3: Cross multiply
   1,561.20x = 2,154.56 × 1,036.88
4. Step 4: Simplify right side
   1,561.20x = 2,234,020.17
5. Step 5: Solve for x
   x = 2,234,020.17/1,561.20
6. Step 6: Final answer
   x = 1,430.96