Finding the Fourth Proportional to 1,437.20, 1,983.32 and 1,087.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,437.20 : 1,983.32 = 1,087.28 : x
2. Step 2: Convert to fraction form
   1,437.20/1,983.32 = 1,087.28/x
3. Step 3: Cross multiply
   1,437.20x = 1,983.32 × 1,087.28
4. Step 4: Simplify right side
   1,437.20x = 2,156,424.17
5. Step 5: Solve for x
   x = 2,156,424.17/1,437.20
6. Step 6: Final answer
   x = 1,500.43