Finding the Fourth Proportional to 2,627.96, 3,939.55 and 1,312.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,627.96 : 3,939.55 = 1,312.12 : x
2. Step 2: Convert to fraction form
   2,627.96/3,939.55 = 1,312.12/x
3. Step 3: Cross multiply
   2,627.96x = 3,939.55 × 1,312.12
4. Step 4: Simplify right side
   2,627.96x = 5,169,162.35
5. Step 5: Solve for x
   x = 5,169,162.35/2,627.96
6. Step 6: Final answer
   x = 1,966.99