Finding the Fourth Proportional to 1,560.66, 2,153.61 and 862.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,560.66 : 2,153.61 = 862.02 : x
2. Step 2: Convert to fraction form
   1,560.66/2,153.61 = 862.02/x
3. Step 3: Cross multiply
   1,560.66x = 2,153.61 × 862.02
4. Step 4: Simplify right side
   1,560.66x = 1,856,454.89
5. Step 5: Solve for x
   x = 1,856,454.89/1,560.66
6. Step 6: Final answer
   x = 1,189.53