Finding the Third Proportional to 117,238.31 and 238,620

Step by Step Solution

1. Step 1: Write the proportion equation
   117,238.31 : 238,620 = 238,620 : x
2. Step 2: Convert to fraction form
   117,238.31/238,620 = 238,620/x
3. Step 3: Cross multiply
   117,238.31x = 238,620 × 238,620
4. Step 4: Simplify right side
   117,238.31x = 56,939,504,400
5. Step 5: Solve for x
   x = 56,939,504,400/117,238.31
6. Step 6: Final answer
   x = 485,673.18