Finding the Fourth Proportional to 1,866.72, 2,577.88 and 1,691.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,866.72 : 2,577.88 = 1,691.76 : x
2. Step 2: Convert to fraction form
   1,866.72/2,577.88 = 1,691.76/x
3. Step 3: Cross multiply
   1,866.72x = 2,577.88 × 1,691.76
4. Step 4: Simplify right side
   1,866.72x = 4,361,154.27
5. Step 5: Solve for x
   x = 4,361,154.27/1,866.72
6. Step 6: Final answer
   x = 2,336.27