Finding the Fourth Proportional to 1,561.32, 2,154.72 and 862.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.32 : 2,154.72 = 862.72 : x
2. Step 2: Convert to fraction form
   1,561.32/2,154.72 = 862.72/x
3. Step 3: Cross multiply
   1,561.32x = 2,154.72 × 862.72
4. Step 4: Simplify right side
   1,561.32x = 1,858,920.04
5. Step 5: Solve for x
   x = 1,858,920.04/1,561.32
6. Step 6: Final answer
   x = 1,190.61