Finding the Fourth Proportional to 12,858.39, 17,752.32 and 8,389.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,858.39 : 17,752.32 = 8,389.89 : x
2. Step 2: Convert to fraction form
   12,858.39/17,752.32 = 8,389.89/x
3. Step 3: Cross multiply
   12,858.39x = 17,752.32 × 8,389.89
4. Step 4: Simplify right side
   12,858.39x = 148,940,012.04
5. Step 5: Solve for x
   x = 148,940,012.04/12,858.39
6. Step 6: Final answer
   x = 11,583.10