Finding the Fourth Proportional to 2,321.30, 3,483.12 and 860.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,321.30 : 3,483.12 = 860.78 : x
2. Step 2: Convert to fraction form
   2,321.30/3,483.12 = 860.78/x
3. Step 3: Cross multiply
   2,321.30x = 3,483.12 × 860.78
4. Step 4: Simplify right side
   2,321.30x = 2,998,200.03
5. Step 5: Solve for x
   x = 2,998,200.03/2,321.30
6. Step 6: Final answer
   x = 1,291.60