Finding the Fourth Proportional to 1,427.28, 2,139.15 and 1,015.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,427.28 : 2,139.15 = 1,015.56 : x
2. Step 2: Convert to fraction form
   1,427.28/2,139.15 = 1,015.56/x
3. Step 3: Cross multiply
   1,427.28x = 2,139.15 × 1,015.56
4. Step 4: Simplify right side
   1,427.28x = 2,172,435.17
5. Step 5: Solve for x
   x = 2,172,435.17/1,427.28
6. Step 6: Final answer
   x = 1,522.08