Finding the Fourth Proportional to 12,885.95, 17,784.09 and 7,222.23

Step by Step Solution

1. Step 1: Write the proportion equation
   12,885.95 : 17,784.09 = 7,222.23 : x
2. Step 2: Convert to fraction form
   12,885.95/17,784.09 = 7,222.23/x
3. Step 3: Cross multiply
   12,885.95x = 17,784.09 × 7,222.23
4. Step 4: Simplify right side
   12,885.95x = 128,440,788.32
5. Step 5: Solve for x
   x = 128,440,788.32/12,885.95
6. Step 6: Final answer
   x = 9,967.50