Finding the Fourth Proportional to 12,922.05, 17,834.39 and 7,889.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,922.05 : 17,834.39 = 7,889.20 : x
2. Step 2: Convert to fraction form
   12,922.05/17,834.39 = 7,889.20/x
3. Step 3: Cross multiply
   12,922.05x = 17,834.39 × 7,889.20
4. Step 4: Simplify right side
   12,922.05x = 140,699,069.59
5. Step 5: Solve for x
   x = 140,699,069.59/12,922.05
6. Step 6: Final answer
   x = 10,888.29