Finding the Third Proportional to 135,123 and 209,240.25

Step by Step Solution

1. Step 1: Write the proportion equation
   135,123 : 209,240.25 = 209,240.25 : x
2. Step 2: Convert to fraction form
   135,123/209,240.25 = 209,240.25/x
3. Step 3: Cross multiply
   135,123x = 209,240.25 × 209,240.25
4. Step 4: Simplify right side
   135,123x = 43,781,482,220.06
5. Step 5: Solve for x
   x = 43,781,482,220.06/135,123
6. Step 6: Final answer
   x = 324,012.06