Finding the Third Proportional to 311,838 and 660,483.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,838 : 660,483.50 = 660,483.50 : x
2. Step 2: Convert to fraction form
   311,838/660,483.50 = 660,483.50/x
3. Step 3: Cross multiply
   311,838x = 660,483.50 × 660,483.50
4. Step 4: Simplify right side
   311,838x = 436,238,453,772.25
5. Step 5: Solve for x
   x = 436,238,453,772.25/311,838
6. Step 6: Final answer
   x = 1,398,926.54