Finding the Third Proportional to 135,196.50 and 312,972

Step by Step Solution

1. Step 1: Write the proportion equation
   135,196.50 : 312,972 = 312,972 : x
2. Step 2: Convert to fraction form
   135,196.50/312,972 = 312,972/x
3. Step 3: Cross multiply
   135,196.50x = 312,972 × 312,972
4. Step 4: Simplify right side
   135,196.50x = 97,951,472,784
5. Step 5: Solve for x
   x = 97,951,472,784/135,196.50
6. Step 6: Final answer
   x = 724,511.90