Finding the Fourth Proportional to 11,686.08, 17,522.56 and 3,890.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,686.08 : 17,522.56 = 3,890.72 : x
2. Step 2: Convert to fraction form
   11,686.08/17,522.56 = 3,890.72/x
3. Step 3: Cross multiply
   11,686.08x = 17,522.56 × 3,890.72
4. Step 4: Simplify right side
   11,686.08x = 68,175,374.64
5. Step 5: Solve for x
   x = 68,175,374.64/11,686.08
6. Step 6: Final answer
   x = 5,833.90