Finding the Third Proportional to 90,430 and 137,749

Step by Step Solution

1. Step 1: Write the proportion equation
   90,430 : 137,749 = 137,749 : x
2. Step 2: Convert to fraction form
   90,430/137,749 = 137,749/x
3. Step 3: Cross multiply
   90,430x = 137,749 × 137,749
4. Step 4: Simplify right side
   90,430x = 18,974,787,001
5. Step 5: Solve for x
   x = 18,974,787,001/90,430
6. Step 6: Final answer
   x = 209,828.45