Finding the Fourth Proportional to 1,431.26, 2,155.72 and 1,329.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.26 : 2,155.72 = 1,329.86 : x
2. Step 2: Convert to fraction form
   1,431.26/2,155.72 = 1,329.86/x
3. Step 3: Cross multiply
   1,431.26x = 2,155.72 × 1,329.86
4. Step 4: Simplify right side
   1,431.26x = 2,866,799.15
5. Step 5: Solve for x
   x = 2,866,799.15/1,431.26
6. Step 6: Final answer
   x = 2,002.99