Finding the Fourth Proportional to 17,258.56, 23,788.10 and 12,216.31

Step by Step Solution

1. Step 1: Write the proportion equation
   17,258.56 : 23,788.10 = 12,216.31 : x
2. Step 2: Convert to fraction form
   17,258.56/23,788.10 = 12,216.31/x
3. Step 3: Cross multiply
   17,258.56x = 23,788.10 × 12,216.31
4. Step 4: Simplify right side
   17,258.56x = 290,602,774.98
5. Step 5: Solve for x
   x = 290,602,774.98/17,258.56
6. Step 6: Final answer
   x = 16,838.18