Finding the Fourth Proportional to 12,485.29, 17,221.69 and 7,637.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,485.29 : 17,221.69 = 7,637.76 : x
2. Step 2: Convert to fraction form
   12,485.29/17,221.69 = 7,637.76/x
3. Step 3: Cross multiply
   12,485.29x = 17,221.69 × 7,637.76
4. Step 4: Simplify right side
   12,485.29x = 131,535,026.26
5. Step 5: Solve for x
   x = 131,535,026.26/12,485.29
6. Step 6: Final answer
   x = 10,535.20