Finding the Third Proportional to 311,535 and 680,726.25

Step by Step Solution

1. Step 1: Write the proportion equation
   311,535 : 680,726.25 = 680,726.25 : x
2. Step 2: Convert to fraction form
   311,535/680,726.25 = 680,726.25/x
3. Step 3: Cross multiply
   311,535x = 680,726.25 × 680,726.25
4. Step 4: Simplify right side
   311,535x = 463,388,227,439.06
5. Step 5: Solve for x
   x = 463,388,227,439.06/311,535
6. Step 6: Final answer
   x = 1,487,435.53