Finding the Third Proportional to 5,118.19 and 7,150.78

Step by Step Solution

1. Step 1: Write the proportion equation
   5,118.19 : 7,150.78 = 7,150.78 : x
2. Step 2: Convert to fraction form
   5,118.19/7,150.78 = 7,150.78/x
3. Step 3: Cross multiply
   5,118.19x = 7,150.78 × 7,150.78
4. Step 4: Simplify right side
   5,118.19x = 51,133,672.49
5. Step 5: Solve for x
   x = 51,133,672.49/5,118.19
6. Step 6: Final answer
   x = 9,990.58