Finding the Fourth Proportional to 2,307.69, 3,183.39 and 1,561.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,307.69 : 3,183.39 = 1,561.91 : x
2. Step 2: Convert to fraction form
   2,307.69/3,183.39 = 1,561.91/x
3. Step 3: Cross multiply
   2,307.69x = 3,183.39 × 1,561.91
4. Step 4: Simplify right side
   2,307.69x = 4,972,152.76
5. Step 5: Solve for x
   x = 4,972,152.76/2,307.69
6. Step 6: Final answer
   x = 2,154.60