Finding the Third Proportional to 309,645 and 478,555.50

Step by Step Solution

1. Step 1: Write the proportion equation
   309,645 : 478,555.50 = 478,555.50 : x
2. Step 2: Convert to fraction form
   309,645/478,555.50 = 478,555.50/x
3. Step 3: Cross multiply
   309,645x = 478,555.50 × 478,555.50
4. Step 4: Simplify right side
   309,645x = 229,015,366,580.25
5. Step 5: Solve for x
   x = 229,015,366,580.25/309,645
6. Step 6: Final answer
   x = 739,606.22