Finding the Fourth Proportional to 12,788.43, 17,647.99 and 7,123.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,788.43 : 17,647.99 = 7,123.25 : x
2. Step 2: Convert to fraction form
   12,788.43/17,647.99 = 7,123.25/x
3. Step 3: Cross multiply
   12,788.43x = 17,647.99 × 7,123.25
4. Step 4: Simplify right side
   12,788.43x = 125,711,044.77
5. Step 5: Solve for x
   x = 125,711,044.77/12,788.43
6. Step 6: Final answer
   x = 9,830.06