Finding the Fourth Proportional to 1,247.10, 1,863.89 and 1,148.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,247.10 : 1,863.89 = 1,148.59 : x
2. Step 2: Convert to fraction form
   1,247.10/1,863.89 = 1,148.59/x
3. Step 3: Cross multiply
   1,247.10x = 1,863.89 × 1,148.59
4. Step 4: Simplify right side
   1,247.10x = 2,140,835.82
5. Step 5: Solve for x
   x = 2,140,835.82/1,247.10
6. Step 6: Final answer
   x = 1,716.65