Finding the Fourth Proportional to 11,858.87, 17,786.59 and 3,538.55

Step by Step Solution

1. Step 1: Write the proportion equation
   11,858.87 : 17,786.59 = 3,538.55 : x
2. Step 2: Convert to fraction form
   11,858.87/17,786.59 = 3,538.55/x
3. Step 3: Cross multiply
   11,858.87x = 17,786.59 × 3,538.55
4. Step 4: Simplify right side
   11,858.87x = 62,938,773.66
5. Step 5: Solve for x
   x = 62,938,773.66/11,858.87
6. Step 6: Final answer
   x = 5,307.32