Finding the Fourth Proportional to 1,522.10, 2,280.32 and 870.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,522.10 : 2,280.32 = 870.86 : x
2. Step 2: Convert to fraction form
   1,522.10/2,280.32 = 870.86/x
3. Step 3: Cross multiply
   1,522.10x = 2,280.32 × 870.86
4. Step 4: Simplify right side
   1,522.10x = 1,985,839.48
5. Step 5: Solve for x
   x = 1,985,839.48/1,522.10
6. Step 6: Final answer
   x = 1,304.67