Finding the Fourth Proportional to 12,886.82, 17,785.06 and 7,222.53

Step by Step Solution

1. Step 1: Write the proportion equation
   12,886.82 : 17,785.06 = 7,222.53 : x
2. Step 2: Convert to fraction form
   12,886.82/17,785.06 = 7,222.53/x
3. Step 3: Cross multiply
   12,886.82x = 17,785.06 × 7,222.53
4. Step 4: Simplify right side
   12,886.82x = 128,453,048.29
5. Step 5: Solve for x
   x = 128,453,048.29/12,886.82
6. Step 6: Final answer
   x = 9,967.78