Finding the Fourth Proportional to 2,659.89, 3,666.87 and 1,913.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.89 : 3,666.87 = 1,913.61 : x
2. Step 2: Convert to fraction form
   2,659.89/3,666.87 = 1,913.61/x
3. Step 3: Cross multiply
   2,659.89x = 3,666.87 × 1,913.61
4. Step 4: Simplify right side
   2,659.89x = 7,016,959.10
5. Step 5: Solve for x
   x = 7,016,959.10/2,659.89
6. Step 6: Final answer
   x = 2,638.06