Finding the Third Proportional to 144,856.50 and 312,069

Step by Step Solution

1. Step 1: Write the proportion equation
   144,856.50 : 312,069 = 312,069 : x
2. Step 2: Convert to fraction form
   144,856.50/312,069 = 312,069/x
3. Step 3: Cross multiply
   144,856.50x = 312,069 × 312,069
4. Step 4: Simplify right side
   144,856.50x = 97,387,060,761
5. Step 5: Solve for x
   x = 97,387,060,761/144,856.50
6. Step 6: Final answer
   x = 672,300.25