Finding the Fourth Proportional to 2,601.48, 3,900.86 and 1,120.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,601.48 : 3,900.86 = 1,120.70 : x
2. Step 2: Convert to fraction form
   2,601.48/3,900.86 = 1,120.70/x
3. Step 3: Cross multiply
   2,601.48x = 3,900.86 × 1,120.70
4. Step 4: Simplify right side
   2,601.48x = 4,371,702.15
5. Step 5: Solve for x
   x = 4,371,702.15/2,601.48
6. Step 6: Final answer
   x = 1,680.46