Finding the Fourth Proportional to 2,312.12, 3,190.72 and 1,264.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,312.12 : 3,190.72 = 1,264.18 : x
2. Step 2: Convert to fraction form
   2,312.12/3,190.72 = 1,264.18/x
3. Step 3: Cross multiply
   2,312.12x = 3,190.72 × 1,264.18
4. Step 4: Simplify right side
   2,312.12x = 4,033,644.41
5. Step 5: Solve for x
   x = 4,033,644.41/2,312.12
6. Step 6: Final answer
   x = 1,744.57