Finding the Fourth Proportional to 12,643.31, 17,447.78 and 7,054.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,643.31 : 17,447.78 = 7,054.31 : x
2. Step 2: Convert to fraction form
   12,643.31/17,447.78 = 7,054.31/x
3. Step 3: Cross multiply
   12,643.31x = 17,447.78 × 7,054.31
4. Step 4: Simplify right side
   12,643.31x = 123,082,110.19
5. Step 5: Solve for x
   x = 123,082,110.19/12,643.31
6. Step 6: Final answer
   x = 9,734.96