Finding the Fourth Proportional to 2,312.51, 3,191.27 and 1,264.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,312.51 : 3,191.27 = 1,264.57 : x
2. Step 2: Convert to fraction form
   2,312.51/3,191.27 = 1,264.57/x
3. Step 3: Cross multiply
   2,312.51x = 3,191.27 × 1,264.57
4. Step 4: Simplify right side
   2,312.51x = 4,035,584.30
5. Step 5: Solve for x
   x = 4,035,584.30/2,312.51
6. Step 6: Final answer
   x = 1,745.11