Finding the Third Proportional to 3,390.19 and 5,147.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,390.19 : 5,147.72 = 5,147.72 : x
2. Step 2: Convert to fraction form
   3,390.19/5,147.72 = 5,147.72/x
3. Step 3: Cross multiply
   3,390.19x = 5,147.72 × 5,147.72
4. Step 4: Simplify right side
   3,390.19x = 26,499,008.33
5. Step 5: Solve for x
   x = 26,499,008.33/3,390.19
6. Step 6: Final answer
   x = 7,816.38