Finding the Third Proportional to 137,656.50 and 208,390

Step by Step Solution

1. Step 1: Write the proportion equation
   137,656.50 : 208,390 = 208,390 : x
2. Step 2: Convert to fraction form
   137,656.50/208,390 = 208,390/x
3. Step 3: Cross multiply
   137,656.50x = 208,390 × 208,390
4. Step 4: Simplify right side
   137,656.50x = 43,426,392,100
5. Step 5: Solve for x
   x = 43,426,392,100/137,656.50
6. Step 6: Final answer
   x = 315,469.24