Finding the Third Proportional to 5,139 and 7,940.25

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139 : 7,940.25 = 7,940.25 : x
2. Step 2: Convert to fraction form
   5,139/7,940.25 = 7,940.25/x
3. Step 3: Cross multiply
   5,139x = 7,940.25 × 7,940.25
4. Step 4: Simplify right side
   5,139x = 63,047,570.06
5. Step 5: Solve for x
   x = 63,047,570.06/5,139
6. Step 6: Final answer
   x = 12,268.45