Finding the Fourth Proportional to 12,617.78, 17,412.17 and 7,312.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,617.78 : 17,412.17 = 7,312.28 : x
2. Step 2: Convert to fraction form
   12,617.78/17,412.17 = 7,312.28/x
3. Step 3: Cross multiply
   12,617.78x = 17,412.17 × 7,312.28
4. Step 4: Simplify right side
   12,617.78x = 127,322,538.83
5. Step 5: Solve for x
   x = 127,322,538.83/12,617.78
6. Step 6: Final answer
   x = 10,090.73