Finding the Third Proportional to 133,218 and 285,430.50

Step by Step Solution

1. Step 1: Write the proportion equation
   133,218 : 285,430.50 = 285,430.50 : x
2. Step 2: Convert to fraction form
   133,218/285,430.50 = 285,430.50/x
3. Step 3: Cross multiply
   133,218x = 285,430.50 × 285,430.50
4. Step 4: Simplify right side
   133,218x = 81,470,570,330.25
5. Step 5: Solve for x
   x = 81,470,570,330.25/133,218
6. Step 6: Final answer
   x = 611,558.28