Finding the Fourth Proportional to 1,339.20, 1,847.24 and 866.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.20 : 1,847.24 = 866.90 : x
2. Step 2: Convert to fraction form
   1,339.20/1,847.24 = 866.90/x
3. Step 3: Cross multiply
   1,339.20x = 1,847.24 × 866.90
4. Step 4: Simplify right side
   1,339.20x = 1,601,375.89
5. Step 5: Solve for x
   x = 1,601,375.89/1,339.20
6. Step 6: Final answer
   x = 1,195.77