Finding the Fourth Proportional to 1,560.76, 2,153.78 and 862.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,560.76 : 2,153.78 = 862.12 : x
2. Step 2: Convert to fraction form
   1,560.76/2,153.78 = 862.12/x
3. Step 3: Cross multiply
   1,560.76x = 2,153.78 × 862.12
4. Step 4: Simplify right side
   1,560.76x = 1,856,816.81
5. Step 5: Solve for x
   x = 1,856,816.81/1,560.76
6. Step 6: Final answer
   x = 1,189.69