Finding the Fourth Proportional to 12,719.79, 17,553.31 and 7,055.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,719.79 : 17,553.31 = 7,055.40 : x
2. Step 2: Convert to fraction form
   12,719.79/17,553.31 = 7,055.40/x
3. Step 3: Cross multiply
   12,719.79x = 17,553.31 × 7,055.40
4. Step 4: Simplify right side
   12,719.79x = 123,845,623.37
5. Step 5: Solve for x
   x = 123,845,623.37/12,719.79
6. Step 6: Final answer
   x = 9,736.45