Finding the Fourth Proportional to 1,553.48, 2,328.12 and 860.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.48 : 2,328.12 = 860.12 : x
2. Step 2: Convert to fraction form
   1,553.48/2,328.12 = 860.12/x
3. Step 3: Cross multiply
   1,553.48x = 2,328.12 × 860.12
4. Step 4: Simplify right side
   1,553.48x = 2,002,462.57
5. Step 5: Solve for x
   x = 2,002,462.57/1,553.48
6. Step 6: Final answer
   x = 1,289.02