Finding the Fourth Proportional to 2,679.77, 3,698.52 and 1,561.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,679.77 : 3,698.52 = 1,561.35 : x
2. Step 2: Convert to fraction form
   2,679.77/3,698.52 = 1,561.35/x
3. Step 3: Cross multiply
   2,679.77x = 3,698.52 × 1,561.35
4. Step 4: Simplify right side
   2,679.77x = 5,774,684.20
5. Step 5: Solve for x
   x = 5,774,684.20/2,679.77
6. Step 6: Final answer
   x = 2,154.92