Finding the Fourth Proportional to 1,340.60, 1,850.99 and 869.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.60 : 1,850.99 = 869.18 : x
2. Step 2: Convert to fraction form
   1,340.60/1,850.99 = 869.18/x
3. Step 3: Cross multiply
   1,340.60x = 1,850.99 × 869.18
4. Step 4: Simplify right side
   1,340.60x = 1,608,829.89
5. Step 5: Solve for x
   x = 1,608,829.89/1,340.60
6. Step 6: Final answer
   x = 1,200.09