Finding the Fourth Proportional to 12,887.62, 17,785.63 and 7,222.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,887.62 : 17,785.63 = 7,222.04 : x
2. Step 2: Convert to fraction form
   12,887.62/17,785.63 = 7,222.04/x
3. Step 3: Cross multiply
   12,887.62x = 17,785.63 × 7,222.04
4. Step 4: Simplify right side
   12,887.62x = 128,448,427.43
5. Step 5: Solve for x
   x = 128,448,427.43/12,887.62
6. Step 6: Final answer
   x = 9,966.81