Finding the Fourth Proportional to 1,561.34, 2,154.66 and 862.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,561.34 : 2,154.66 = 862.72 : x
2. Step 2: Convert to fraction form
   1,561.34/2,154.66 = 862.72/x
3. Step 3: Cross multiply
   1,561.34x = 2,154.66 × 862.72
4. Step 4: Simplify right side
   1,561.34x = 1,858,868.28
5. Step 5: Solve for x
   x = 1,858,868.28/1,561.34
6. Step 6: Final answer
   x = 1,190.56