Finding the Fourth Proportional to 2,680.70, 3,699.18 and 1,561.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,680.70 : 3,699.18 = 1,561.46 : x
2. Step 2: Convert to fraction form
   2,680.70/3,699.18 = 1,561.46/x
3. Step 3: Cross multiply
   2,680.70x = 3,699.18 × 1,561.46
4. Step 4: Simplify right side
   2,680.70x = 5,776,103.11
5. Step 5: Solve for x
   x = 5,776,103.11/2,680.70
6. Step 6: Final answer
   x = 2,154.70