Finding the Fourth Proportional to 12,920.50, 17,820.56 and 8,948.26

Step by Step Solution

1. Step 1: Write the proportion equation
   12,920.50 : 17,820.56 = 8,948.26 : x
2. Step 2: Convert to fraction form
   12,920.50/17,820.56 = 8,948.26/x
3. Step 3: Cross multiply
   12,920.50x = 17,820.56 × 8,948.26
4. Step 4: Simplify right side
   12,920.50x = 159,463,004.23
5. Step 5: Solve for x
   x = 159,463,004.23/12,920.50
6. Step 6: Final answer
   x = 12,341.86