Finding the Fourth Proportional to 3,888.78, 5,806.65 and 3,669.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,888.78 : 5,806.65 = 3,669.52 : x
2. Step 2: Convert to fraction form
   3,888.78/5,806.65 = 3,669.52/x
3. Step 3: Cross multiply
   3,888.78x = 5,806.65 × 3,669.52
4. Step 4: Simplify right side
   3,888.78x = 21,307,618.31
5. Step 5: Solve for x
   x = 21,307,618.31/3,888.78
6. Step 6: Final answer
   x = 5,479.26