Finding the Fourth Proportional to 1,340.66, 1,850.38 and 987.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,340.66 : 1,850.38 = 987.10 : x
2. Step 2: Convert to fraction form
   1,340.66/1,850.38 = 987.10/x
3. Step 3: Cross multiply
   1,340.66x = 1,850.38 × 987.10
4. Step 4: Simplify right side
   1,340.66x = 1,826,510.10
5. Step 5: Solve for x
   x = 1,826,510.10/1,340.66
6. Step 6: Final answer
   x = 1,362.40