Finding the Fourth Proportional to 1,788.16, 2,454.50 and 1,587.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,788.16 : 2,454.50 = 1,587.28 : x
2. Step 2: Convert to fraction form
   1,788.16/2,454.50 = 1,587.28/x
3. Step 3: Cross multiply
   1,788.16x = 2,454.50 × 1,587.28
4. Step 4: Simplify right side
   1,788.16x = 3,895,978.76
5. Step 5: Solve for x
   x = 3,895,978.76/1,788.16
6. Step 6: Final answer
   x = 2,178.76