Finding the Fourth Proportional to 2,287.18, 3,156.29 and 1,292.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.18 : 3,156.29 = 1,292.78 : x
2. Step 2: Convert to fraction form
   2,287.18/3,156.29 = 1,292.78/x
3. Step 3: Cross multiply
   2,287.18x = 3,156.29 × 1,292.78
4. Step 4: Simplify right side
   2,287.18x = 4,080,388.59
5. Step 5: Solve for x
   x = 4,080,388.59/2,287.18
6. Step 6: Final answer
   x = 1,784.03