Finding the Fourth Proportional to 1,485.67, 2,227.42 and 860.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,485.67 : 2,227.42 = 860.10 : x
2. Step 2: Convert to fraction form
   1,485.67/2,227.42 = 860.10/x
3. Step 3: Cross multiply
   1,485.67x = 2,227.42 × 860.10
4. Step 4: Simplify right side
   1,485.67x = 1,915,803.94
5. Step 5: Solve for x
   x = 1,915,803.94/1,485.67
6. Step 6: Final answer
   x = 1,289.52