Finding the Fourth Proportional to 2,287.48, 3,156.56 and 1,292.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,287.48 : 3,156.56 = 1,292.80 : x
2. Step 2: Convert to fraction form
   2,287.48/3,156.56 = 1,292.80/x
3. Step 3: Cross multiply
   2,287.48x = 3,156.56 × 1,292.80
4. Step 4: Simplify right side
   2,287.48x = 4,080,800.77
5. Step 5: Solve for x
   x = 4,080,800.77/2,287.48
6. Step 6: Final answer
   x = 1,783.97