Finding the Fourth Proportional to 3,109.07, 4,292.59 and 2,389.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,109.07 : 4,292.59 = 2,389.98 : x
2. Step 2: Convert to fraction form
   3,109.07/4,292.59 = 2,389.98/x
3. Step 3: Cross multiply
   3,109.07x = 4,292.59 × 2,389.98
4. Step 4: Simplify right side
   3,109.07x = 10,259,192.30
5. Step 5: Solve for x
   x = 10,259,192.30/3,109.07
6. Step 6: Final answer
   x = 3,299.76