Finding the Fourth Proportional to 12,629.01, 17,420.89 and 7,905.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,629.01 : 17,420.89 = 7,905.09 : x
2. Step 2: Convert to fraction form
   12,629.01/17,420.89 = 7,905.09/x
3. Step 3: Cross multiply
   12,629.01x = 17,420.89 × 7,905.09
4. Step 4: Simplify right side
   12,629.01x = 137,713,703.33
5. Step 5: Solve for x
   x = 137,713,703.33/12,629.01
6. Step 6: Final answer
   x = 10,904.55