Finding the Third Proportional to 91,515 and 213,799.50

Step by Step Solution

1. Step 1: Write the proportion equation
   91,515 : 213,799.50 = 213,799.50 : x
2. Step 2: Convert to fraction form
   91,515/213,799.50 = 213,799.50/x
3. Step 3: Cross multiply
   91,515x = 213,799.50 × 213,799.50
4. Step 4: Simplify right side
   91,515x = 45,710,226,200.25
5. Step 5: Solve for x
   x = 45,710,226,200.25/91,515
6. Step 6: Final answer
   x = 499,483.43