Finding the Fourth Proportional to 2,329.78, 3,212.88 and 1,531.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,329.78 : 3,212.88 = 1,531.69 : x
2. Step 2: Convert to fraction form
   2,329.78/3,212.88 = 1,531.69/x
3. Step 3: Cross multiply
   2,329.78x = 3,212.88 × 1,531.69
4. Step 4: Simplify right side
   2,329.78x = 4,921,136.17
5. Step 5: Solve for x
   x = 4,921,136.17/2,329.78
6. Step 6: Final answer
   x = 2,112.28