Finding the Fourth Proportional to 2,680.86, 3,698.68 and 1,561.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,680.86 : 3,698.68 = 1,561.55 : x
2. Step 2: Convert to fraction form
   2,680.86/3,698.68 = 1,561.55/x
3. Step 3: Cross multiply
   2,680.86x = 3,698.68 × 1,561.55
4. Step 4: Simplify right side
   2,680.86x = 5,775,665.95
5. Step 5: Solve for x
   x = 5,775,665.95/2,680.86
6. Step 6: Final answer
   x = 2,154.41