Finding the Fourth Proportional to 2,288.63, 3,158.31 and 1,240.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,288.63 : 3,158.31 = 1,240.70 : x
2. Step 2: Convert to fraction form
   2,288.63/3,158.31 = 1,240.70/x
3. Step 3: Cross multiply
   2,288.63x = 3,158.31 × 1,240.70
4. Step 4: Simplify right side
   2,288.63x = 3,918,499.43
5. Step 5: Solve for x
   x = 3,918,499.43/2,288.63
6. Step 6: Final answer
   x = 1,712.16