Finding the Fourth Proportional to 2,617.55, 3,612.29 and 1,438.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.55 : 3,612.29 = 1,438.70 : x
2. Step 2: Convert to fraction form
   2,617.55/3,612.29 = 1,438.70/x
3. Step 3: Cross multiply
   2,617.55x = 3,612.29 × 1,438.70
4. Step 4: Simplify right side
   2,617.55x = 5,196,976.37
5. Step 5: Solve for x
   x = 5,196,976.37/2,617.55
6. Step 6: Final answer
   x = 1,985.44