Finding the Fourth Proportional to 2,887.59, 3,984.89 and 1,561.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,887.59 : 3,984.89 = 1,561.31 : x
2. Step 2: Convert to fraction form
   2,887.59/3,984.89 = 1,561.31/x
3. Step 3: Cross multiply
   2,887.59x = 3,984.89 × 1,561.31
4. Step 4: Simplify right side
   2,887.59x = 6,221,648.61
5. Step 5: Solve for x
   x = 6,221,648.61/2,887.59
6. Step 6: Final answer
   x = 2,154.62