Finding the Fourth Proportional to 2,680.76, 3,699.55 and 1,561.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,680.76 : 3,699.55 = 1,561.52 : x
2. Step 2: Convert to fraction form
   2,680.76/3,699.55 = 1,561.52/x
3. Step 3: Cross multiply
   2,680.76x = 3,699.55 × 1,561.52
4. Step 4: Simplify right side
   2,680.76x = 5,776,902.11
5. Step 5: Solve for x
   x = 5,776,902.11/2,680.76
6. Step 6: Final answer
   x = 2,154.95