Finding the Third Proportional to 91,388 and 200,430.50

Step by Step Solution

1. Step 1: Write the proportion equation
   91,388 : 200,430.50 = 200,430.50 : x
2. Step 2: Convert to fraction form
   91,388/200,430.50 = 200,430.50/x
3. Step 3: Cross multiply
   91,388x = 200,430.50 × 200,430.50
4. Step 4: Simplify right side
   91,388x = 40,172,385,330.25
5. Step 5: Solve for x
   x = 40,172,385,330.25/91,388
6. Step 6: Final answer
   x = 439,580.53