Finding the Third Proportional to 312,278 and 649,088.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,278 : 649,088.50 = 649,088.50 : x
2. Step 2: Convert to fraction form
   312,278/649,088.50 = 649,088.50/x
3. Step 3: Cross multiply
   312,278x = 649,088.50 × 649,088.50
4. Step 4: Simplify right side
   312,278x = 421,315,880,832.25
5. Step 5: Solve for x
   x = 421,315,880,832.25/312,278
6. Step 6: Final answer
   x = 1,349,169.27