Finding the Fourth Proportional to 5,109.19, 7,659.61 and 2,644.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,109.19 : 7,659.61 = 2,644.72 : x
2. Step 2: Convert to fraction form
   5,109.19/7,659.61 = 2,644.72/x
3. Step 3: Cross multiply
   5,109.19x = 7,659.61 × 2,644.72
4. Step 4: Simplify right side
   5,109.19x = 20,257,498.00
5. Step 5: Solve for x
   x = 20,257,498.00/5,109.19
6. Step 6: Final answer
   x = 3,964.92