Finding the Fourth Proportional to 2,521.72, 3,780.15 and 1,698.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,521.72 : 3,780.15 = 1,698.15 : x
2. Step 2: Convert to fraction form
   2,521.72/3,780.15 = 1,698.15/x
3. Step 3: Cross multiply
   2,521.72x = 3,780.15 × 1,698.15
4. Step 4: Simplify right side
   2,521.72x = 6,419,261.72
5. Step 5: Solve for x
   x = 6,419,261.72/2,521.72
6. Step 6: Final answer
   x = 2,545.59