Finding the Third Proportional to 149,296.50 and 316,089

Step by Step Solution

1. Step 1: Write the proportion equation
   149,296.50 : 316,089 = 316,089 : x
2. Step 2: Convert to fraction form
   149,296.50/316,089 = 316,089/x
3. Step 3: Cross multiply
   149,296.50x = 316,089 × 316,089
4. Step 4: Simplify right side
   149,296.50x = 99,912,255,921
5. Step 5: Solve for x
   x = 99,912,255,921/149,296.50
6. Step 6: Final answer
   x = 669,220.35