Finding the Third Proportional to 138,189 and 207,242.88

Step by Step Solution

1. Step 1: Write the proportion equation
   138,189 : 207,242.88 = 207,242.88 : x
2. Step 2: Convert to fraction form
   138,189/207,242.88 = 207,242.88/x
3. Step 3: Cross multiply
   138,189x = 207,242.88 × 207,242.88
4. Step 4: Simplify right side
   138,189x = 42,949,609,238.27
5. Step 5: Solve for x
   x = 42,949,609,238.27/138,189
6. Step 6: Final answer
   x = 310,803.39