Finding the Third Proportional to 138,739 and 299,074.50

Step by Step Solution

1. Step 1: Write the proportion equation
   138,739 : 299,074.50 = 299,074.50 : x
2. Step 2: Convert to fraction form
   138,739/299,074.50 = 299,074.50/x
3. Step 3: Cross multiply
   138,739x = 299,074.50 × 299,074.50
4. Step 4: Simplify right side
   138,739x = 89,445,556,550.25
5. Step 5: Solve for x
   x = 89,445,556,550.25/138,739
6. Step 6: Final answer
   x = 644,703.77