Finding the Third Proportional to 290,064 and 448,216.50

Step by Step Solution

1. Step 1: Write the proportion equation
   290,064 : 448,216.50 = 448,216.50 : x
2. Step 2: Convert to fraction form
   290,064/448,216.50 = 448,216.50/x
3. Step 3: Cross multiply
   290,064x = 448,216.50 × 448,216.50
4. Step 4: Simplify right side
   290,064x = 200,898,030,872.25
5. Step 5: Solve for x
   x = 200,898,030,872.25/290,064
6. Step 6: Final answer
   x = 692,598.98