Finding the Fourth Proportional to 1,387.82, 2,082.27 and 1,274.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.82 : 2,082.27 = 1,274.42 : x
2. Step 2: Convert to fraction form
   1,387.82/2,082.27 = 1,274.42/x
3. Step 3: Cross multiply
   1,387.82x = 2,082.27 × 1,274.42
4. Step 4: Simplify right side
   1,387.82x = 2,653,686.53
5. Step 5: Solve for x
   x = 2,653,686.53/1,387.82
6. Step 6: Final answer
   x = 1,912.13