Finding the Fourth Proportional to 2,359.81, 3,256.70 and 1,561.76

Step by Step Solution

1. Step 1: Write the proportion equation
   2,359.81 : 3,256.70 = 1,561.76 : x
2. Step 2: Convert to fraction form
   2,359.81/3,256.70 = 1,561.76/x
3. Step 3: Cross multiply
   2,359.81x = 3,256.70 × 1,561.76
4. Step 4: Simplify right side
   2,359.81x = 5,086,159.70
5. Step 5: Solve for x
   x = 5,086,159.70/2,359.81
6. Step 6: Final answer
   x = 2,155.33