Finding the Third Proportional to 91,707 and 216,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   91,707 : 216,139.50 = 216,139.50 : x
2. Step 2: Convert to fraction form
   91,707/216,139.50 = 216,139.50/x
3. Step 3: Cross multiply
   91,707x = 216,139.50 × 216,139.50
4. Step 4: Simplify right side
   91,707x = 46,716,283,460.25
5. Step 5: Solve for x
   x = 46,716,283,460.25/91,707
6. Step 6: Final answer
   x = 509,408.04