Finding the Fourth Proportional to 2,309.32, 3,186.92 and 1,261.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,309.32 : 3,186.92 = 1,261.40 : x
2. Step 2: Convert to fraction form
   2,309.32/3,186.92 = 1,261.40/x
3. Step 3: Cross multiply
   2,309.32x = 3,186.92 × 1,261.40
4. Step 4: Simplify right side
   2,309.32x = 4,019,980.89
5. Step 5: Solve for x
   x = 4,019,980.89/2,309.32
6. Step 6: Final answer
   x = 1,740.76