Finding the Fourth Proportional to 1,339.81, 2,010.05 and 1,082.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.81 : 2,010.05 = 1,082.15 : x
2. Step 2: Convert to fraction form
   1,339.81/2,010.05 = 1,082.15/x
3. Step 3: Cross multiply
   1,339.81x = 2,010.05 × 1,082.15
4. Step 4: Simplify right side
   1,339.81x = 2,175,175.61
5. Step 5: Solve for x
   x = 2,175,175.61/1,339.81
6. Step 6: Final answer
   x = 1,623.50