Finding the Third Proportional to 311,697 and 455,881.50

Step by Step Solution

1. Step 1: Write the proportion equation
   311,697 : 455,881.50 = 455,881.50 : x
2. Step 2: Convert to fraction form
   311,697/455,881.50 = 455,881.50/x
3. Step 3: Cross multiply
   311,697x = 455,881.50 × 455,881.50
4. Step 4: Simplify right side
   311,697x = 207,827,942,042.25
5. Step 5: Solve for x
   x = 207,827,942,042.25/311,697
6. Step 6: Final answer
   x = 666,762.73