Finding the Fourth Proportional to 2,331.90, 3,499.67 and 871.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,331.90 : 3,499.67 = 871.47 : x
2. Step 2: Convert to fraction form
   2,331.90/3,499.67 = 871.47/x
3. Step 3: Cross multiply
   2,331.90x = 3,499.67 × 871.47
4. Step 4: Simplify right side
   2,331.90x = 3,049,859.59
5. Step 5: Solve for x
   x = 3,049,859.59/2,331.90
6. Step 6: Final answer
   x = 1,307.89