Finding the Third Proportional to 138,361.50 and 208,813

Step by Step Solution

1. Step 1: Write the proportion equation
   138,361.50 : 208,813 = 208,813 : x
2. Step 2: Convert to fraction form
   138,361.50/208,813 = 208,813/x
3. Step 3: Cross multiply
   138,361.50x = 208,813 × 208,813
4. Step 4: Simplify right side
   138,361.50x = 43,602,868,969
5. Step 5: Solve for x
   x = 43,602,868,969/138,361.50
6. Step 6: Final answer
   x = 315,137.30