Finding the Fourth Proportional to 9,222.90, 12,728.75 and 5,637.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,222.90 : 12,728.75 = 5,637.12 : x
2. Step 2: Convert to fraction form
   9,222.90/12,728.75 = 5,637.12/x
3. Step 3: Cross multiply
   9,222.90x = 12,728.75 × 5,637.12
4. Step 4: Simplify right side
   9,222.90x = 71,753,463.01
5. Step 5: Solve for x
   x = 71,753,463.01/9,222.90
6. Step 6: Final answer
   x = 7,779.92