Finding the Third Proportional to 138,726.50 and 207,710

Step by Step Solution

1. Step 1: Write the proportion equation
   138,726.50 : 207,710 = 207,710 : x
2. Step 2: Convert to fraction form
   138,726.50/207,710 = 207,710/x
3. Step 3: Cross multiply
   138,726.50x = 207,710 × 207,710
4. Step 4: Simplify right side
   138,726.50x = 43,143,444,100
5. Step 5: Solve for x
   x = 43,143,444,100/138,726.50
6. Step 6: Final answer
   x = 310,996.41