Finding the Fourth Proportional to 1,788.61, 2,668.59 and 1,557.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,788.61 : 2,668.59 = 1,557.15 : x
2. Step 2: Convert to fraction form
   1,788.61/2,668.59 = 1,557.15/x
3. Step 3: Cross multiply
   1,788.61x = 2,668.59 × 1,557.15
4. Step 4: Simplify right side
   1,788.61x = 4,155,373.79
5. Step 5: Solve for x
   x = 4,155,373.79/1,788.61
6. Step 6: Final answer
   x = 2,323.25