Finding the Third Proportional to 149,086.50 and 319,476

Step by Step Solution

1. Step 1: Write the proportion equation
   149,086.50 : 319,476 = 319,476 : x
2. Step 2: Convert to fraction form
   149,086.50/319,476 = 319,476/x
3. Step 3: Cross multiply
   149,086.50x = 319,476 × 319,476
4. Step 4: Simplify right side
   149,086.50x = 102,064,914,576
5. Step 5: Solve for x
   x = 102,064,914,576/149,086.50
6. Step 6: Final answer
   x = 684,601.99