Finding the Fourth Proportional to 2,312.77, 3,191.59 and 1,264.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,312.77 : 3,191.59 = 1,264.81 : x
2. Step 2: Convert to fraction form
   2,312.77/3,191.59 = 1,264.81/x
3. Step 3: Cross multiply
   2,312.77x = 3,191.59 × 1,264.81
4. Step 4: Simplify right side
   2,312.77x = 4,036,748.62
5. Step 5: Solve for x
   x = 4,036,748.62/2,312.77
6. Step 6: Final answer
   x = 1,745.42