Finding the Fourth Proportional to 2,147.10, 3,215.76 and 1,279.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,147.10 : 3,215.76 = 1,279.62 : x
2. Step 2: Convert to fraction form
   2,147.10/3,215.76 = 1,279.62/x
3. Step 3: Cross multiply
   2,147.10x = 3,215.76 × 1,279.62
4. Step 4: Simplify right side
   2,147.10x = 4,114,950.81
5. Step 5: Solve for x
   x = 4,114,950.81/2,147.10
6. Step 6: Final answer
   x = 1,916.52