Finding the Third Proportional to 311,865 and 739,987.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,865 : 739,987.50 = 739,987.50 : x
2. Step 2: Convert to fraction form
   311,865/739,987.50 = 739,987.50/x
3. Step 3: Cross multiply
   311,865x = 739,987.50 × 739,987.50
4. Step 4: Simplify right side
   311,865x = 547,581,500,156.25
5. Step 5: Solve for x
   x = 547,581,500,156.25/311,865
6. Step 6: Final answer
   x = 1,755,828.64