Finding the Fourth Proportional to 2,612.25, 3,601.67 and 2,139.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,612.25 : 3,601.67 = 2,139.57 : x
2. Step 2: Convert to fraction form
   2,612.25/3,601.67 = 2,139.57/x
3. Step 3: Cross multiply
   2,612.25x = 3,601.67 × 2,139.57
4. Step 4: Simplify right side
   2,612.25x = 7,706,014.38
5. Step 5: Solve for x
   x = 7,706,014.38/2,612.25
6. Step 6: Final answer
   x = 2,949.95