Finding the Fourth Proportional to 2,592.30, 3,888.72 and 860.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,592.30 : 3,888.72 = 860.52 : x
2. Step 2: Convert to fraction form
   2,592.30/3,888.72 = 860.52/x
3. Step 3: Cross multiply
   2,592.30x = 3,888.72 × 860.52
4. Step 4: Simplify right side
   2,592.30x = 3,346,321.33
5. Step 5: Solve for x
   x = 3,346,321.33/2,592.30
6. Step 6: Final answer
   x = 1,290.87