Finding the Fourth Proportional to 2,659.86, 3,988.61 and 1,015.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.86 : 3,988.61 = 1,015.25 : x
2. Step 2: Convert to fraction form
   2,659.86/3,988.61 = 1,015.25/x
3. Step 3: Cross multiply
   2,659.86x = 3,988.61 × 1,015.25
4. Step 4: Simplify right side
   2,659.86x = 4,049,436.30
5. Step 5: Solve for x
   x = 4,049,436.30/2,659.86
6. Step 6: Final answer
   x = 1,522.42