Finding the Fourth Proportional to 11,909.78, 17,868.25 and 3,590.07

Step by Step Solution

1. Step 1: Write the proportion equation
   11,909.78 : 17,868.25 = 3,590.07 : x
2. Step 2: Convert to fraction form
   11,909.78/17,868.25 = 3,590.07/x
3. Step 3: Cross multiply
   11,909.78x = 17,868.25 × 3,590.07
4. Step 4: Simplify right side
   11,909.78x = 64,148,286.07
5. Step 5: Solve for x
   x = 64,148,286.07/11,909.78
6. Step 6: Final answer
   x = 5,386.18