Finding the Fourth Proportional to 2,312.62, 3,191.46 and 1,264.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,312.62 : 3,191.46 = 1,264.72 : x
2. Step 2: Convert to fraction form
   2,312.62/3,191.46 = 1,264.72/x
3. Step 3: Cross multiply
   2,312.62x = 3,191.46 × 1,264.72
4. Step 4: Simplify right side
   2,312.62x = 4,036,303.29
5. Step 5: Solve for x
   x = 4,036,303.29/2,312.62
6. Step 6: Final answer
   x = 1,745.34