Finding the Fourth Proportional to 1,560.71, 2,153.76 and 862.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,560.71 : 2,153.76 = 862.04 : x
2. Step 2: Convert to fraction form
   1,560.71/2,153.76 = 862.04/x
3. Step 3: Cross multiply
   1,560.71x = 2,153.76 × 862.04
4. Step 4: Simplify right side
   1,560.71x = 1,856,627.27
5. Step 5: Solve for x
   x = 1,856,627.27/1,560.71
6. Step 6: Final answer
   x = 1,189.60