Finding the Third Proportional to 311,722.50 and 672,090

Step by Step Solution

1. Step 1: Write the proportion equation
   311,722.50 : 672,090 = 672,090 : x
2. Step 2: Convert to fraction form
   311,722.50/672,090 = 672,090/x
3. Step 3: Cross multiply
   311,722.50x = 672,090 × 672,090
4. Step 4: Simplify right side
   311,722.50x = 451,704,968,100
5. Step 5: Solve for x
   x = 451,704,968,100/311,722.50
6. Step 6: Final answer
   x = 1,449,061.16