Finding the Fourth Proportional to 1,553.98, 2,328.87 and 860.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.98 : 2,328.87 = 860.62 : x
2. Step 2: Convert to fraction form
   1,553.98/2,328.87 = 860.62/x
3. Step 3: Cross multiply
   1,553.98x = 2,328.87 × 860.62
4. Step 4: Simplify right side
   1,553.98x = 2,004,272.10
5. Step 5: Solve for x
   x = 2,004,272.10/1,553.98
6. Step 6: Final answer
   x = 1,289.77