Finding the Fourth Proportional to 12,888.86, 17,782.56 and 7,222.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,888.86 : 17,782.56 = 7,222.82 : x
2. Step 2: Convert to fraction form
   12,888.86/17,782.56 = 7,222.82/x
3. Step 3: Cross multiply
   12,888.86x = 17,782.56 × 7,222.82
4. Step 4: Simplify right side
   12,888.86x = 128,440,230.02
5. Step 5: Solve for x
   x = 128,440,230.02/12,888.86
6. Step 6: Final answer
   x = 9,965.21