Finding the Third Proportional to 138,868.45 and 297,419.48

Step by Step Solution

1. Step 1: Write the proportion equation
   138,868.45 : 297,419.48 = 297,419.48 : x
2. Step 2: Convert to fraction form
   138,868.45/297,419.48 = 297,419.48/x
3. Step 3: Cross multiply
   138,868.45x = 297,419.48 × 297,419.48
4. Step 4: Simplify right side
   138,868.45x = 88,458,349,685.89
5. Step 5: Solve for x
   x = 88,458,349,685.89/138,868.45
6. Step 6: Final answer
   x = 636,993.84