Finding the Fourth Proportional to 2,145.32, 3,217.50 and 1,279.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.32 : 3,217.50 = 1,279.88 : x
2. Step 2: Convert to fraction form
   2,145.32/3,217.50 = 1,279.88/x
3. Step 3: Cross multiply
   2,145.32x = 3,217.50 × 1,279.88
4. Step 4: Simplify right side
   2,145.32x = 4,118,013.90
5. Step 5: Solve for x
   x = 4,118,013.90/2,145.32
6. Step 6: Final answer
   x = 1,919.53