Finding the Third Proportional to 135,138 and 211,990.50

Step by Step Solution

1. Step 1: Write the proportion equation
   135,138 : 211,990.50 = 211,990.50 : x
2. Step 2: Convert to fraction form
   135,138/211,990.50 = 211,990.50/x
3. Step 3: Cross multiply
   135,138x = 211,990.50 × 211,990.50
4. Step 4: Simplify right side
   135,138x = 44,939,972,090.25
5. Step 5: Solve for x
   x = 44,939,972,090.25/135,138
6. Step 6: Final answer
   x = 332,548.74