Finding the Fourth Proportional to 12,513.78, 17,270.19 and 7,477.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,513.78 : 17,270.19 = 7,477.89 : x
2. Step 2: Convert to fraction form
   12,513.78/17,270.19 = 7,477.89/x
3. Step 3: Cross multiply
   12,513.78x = 17,270.19 × 7,477.89
4. Step 4: Simplify right side
   12,513.78x = 129,144,581.10
5. Step 5: Solve for x
   x = 129,144,581.10/12,513.78
6. Step 6: Final answer
   x = 10,320.19