Finding the Fourth Proportional to 1,875.28, 2,587.98 and 1,089.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,875.28 : 2,587.98 = 1,089.40 : x
2. Step 2: Convert to fraction form
   1,875.28/2,587.98 = 1,089.40/x
3. Step 3: Cross multiply
   1,875.28x = 2,587.98 × 1,089.40
4. Step 4: Simplify right side
   1,875.28x = 2,819,345.41
5. Step 5: Solve for x
   x = 2,819,345.41/1,875.28
6. Step 6: Final answer
   x = 1,503.43