Finding the Third Proportional to 349,431 and 764,290.50

Step by Step Solution

1. Step 1: Write the proportion equation
   349,431 : 764,290.50 = 764,290.50 : x
2. Step 2: Convert to fraction form
   349,431/764,290.50 = 764,290.50/x
3. Step 3: Cross multiply
   349,431x = 764,290.50 × 764,290.50
4. Step 4: Simplify right side
   349,431x = 584,139,968,390.25
5. Step 5: Solve for x
   x = 584,139,968,390.25/349,431
6. Step 6: Final answer
   x = 1,671,689.03