Finding the Third Proportional to 216,156.50 and 345,314.50

Step by Step Solution

1. Step 1: Write the proportion equation
   216,156.50 : 345,314.50 = 345,314.50 : x
2. Step 2: Convert to fraction form
   216,156.50/345,314.50 = 345,314.50/x
3. Step 3: Cross multiply
   216,156.50x = 345,314.50 × 345,314.50
4. Step 4: Simplify right side
   216,156.50x = 119,242,103,910.25
5. Step 5: Solve for x
   x = 119,242,103,910.25/216,156.50
6. Step 6: Final answer
   x = 551,647.09