Finding the Third Proportional to 290,664 and 623,371.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,664 : 623,371.50 = 623,371.50 : x
2. Step 2: Convert to fraction form
   290,664/623,371.50 = 623,371.50/x
3. Step 3: Cross multiply
   290,664x = 623,371.50 × 623,371.50
4. Step 4: Simplify right side
   290,664x = 388,592,027,012.25
5. Step 5: Solve for x
   x = 388,592,027,012.25/290,664
6. Step 6: Final answer
   x = 1,336,911.44