Finding the Third Proportional to 137,749.50 and 212,858

Step by Step Solution

1. Step 1: Write the proportion equation
   137,749.50 : 212,858 = 212,858 : x
2. Step 2: Convert to fraction form
   137,749.50/212,858 = 212,858/x
3. Step 3: Cross multiply
   137,749.50x = 212,858 × 212,858
4. Step 4: Simplify right side
   137,749.50x = 45,308,528,164
5. Step 5: Solve for x
   x = 45,308,528,164/137,749.50
6. Step 6: Final answer
   x = 328,919.73