Finding the Third Proportional to 318,699 and 698,629.50

Step by Step Solution

1. Step 1: Write the proportion equation
   318,699 : 698,629.50 = 698,629.50 : x
2. Step 2: Convert to fraction form
   318,699/698,629.50 = 698,629.50/x
3. Step 3: Cross multiply
   318,699x = 698,629.50 × 698,629.50
4. Step 4: Simplify right side
   318,699x = 488,083,178,270.25
5. Step 5: Solve for x
   x = 488,083,178,270.25/318,699
6. Step 6: Final answer
   x = 1,531,486.38