Finding the Fourth Proportional to 2,647.62, 3,970.35 and 1,259.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,647.62 : 3,970.35 = 1,259.55 : x
2. Step 2: Convert to fraction form
   2,647.62/3,970.35 = 1,259.55/x
3. Step 3: Cross multiply
   2,647.62x = 3,970.35 × 1,259.55
4. Step 4: Simplify right side
   2,647.62x = 5,000,854.34
5. Step 5: Solve for x
   x = 5,000,854.34/2,647.62
6. Step 6: Final answer
   x = 1,888.81