Finding the Third Proportional to 216,157.50 and 345,318

Step by Step Solution

1. Step 1: Write the proportion equation
   216,157.50 : 345,318 = 345,318 : x
2. Step 2: Convert to fraction form
   216,157.50/345,318 = 345,318/x
3. Step 3: Cross multiply
   216,157.50x = 345,318 × 345,318
4. Step 4: Simplify right side
   216,157.50x = 119,244,521,124
5. Step 5: Solve for x
   x = 119,244,521,124/216,157.50
6. Step 6: Final answer
   x = 551,655.72