Finding the Third Proportional to 218,308 and 338,118

Step by Step Solution

1. Step 1: Write the proportion equation
   218,308 : 338,118 = 338,118 : x
2. Step 2: Convert to fraction form
   218,308/338,118 = 338,118/x
3. Step 3: Cross multiply
   218,308x = 338,118 × 338,118
4. Step 4: Simplify right side
   218,308x = 114,323,781,924
5. Step 5: Solve for x
   x = 114,323,781,924/218,308
6. Step 6: Final answer
   x = 523,681.14