Finding the Fourth Proportional to 1,439.52, 2,155.20 and 1,118.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.52 : 2,155.20 = 1,118.64 : x
2. Step 2: Convert to fraction form
   1,439.52/2,155.20 = 1,118.64/x
3. Step 3: Cross multiply
   1,439.52x = 2,155.20 × 1,118.64
4. Step 4: Simplify right side
   1,439.52x = 2,410,892.93
5. Step 5: Solve for x
   x = 2,410,892.93/1,439.52
6. Step 6: Final answer
   x = 1,674.79