Finding the Fourth Proportional to 2,203.59, 3,309.34 and 2,115.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,203.59 : 3,309.34 = 2,115.51 : x
2. Step 2: Convert to fraction form
   2,203.59/3,309.34 = 2,115.51/x
3. Step 3: Cross multiply
   2,203.59x = 3,309.34 × 2,115.51
4. Step 4: Simplify right side
   2,203.59x = 7,000,941.86
5. Step 5: Solve for x
   x = 7,000,941.86/2,203.59
6. Step 6: Final answer
   x = 3,177.06