Finding the Fourth Proportional to 12,455.47, 17,189.40 and 7,612.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,455.47 : 17,189.40 = 7,612.28 : x
2. Step 2: Convert to fraction form
   12,455.47/17,189.40 = 7,612.28/x
3. Step 3: Cross multiply
   12,455.47x = 17,189.40 × 7,612.28
4. Step 4: Simplify right side
   12,455.47x = 130,850,401.82
5. Step 5: Solve for x
   x = 130,850,401.82/12,455.47
6. Step 6: Final answer
   x = 10,505.46