Finding the Third Proportional to 218,703.50 and 478,555

Step by Step Solution

1. Step 1: Write the proportion equation
   218,703.50 : 478,555 = 478,555 : x
2. Step 2: Convert to fraction form
   218,703.50/478,555 = 478,555/x
3. Step 3: Cross multiply
   218,703.50x = 478,555 × 478,555
4. Step 4: Simplify right side
   218,703.50x = 229,014,888,025
5. Step 5: Solve for x
   x = 229,014,888,025/218,703.50
6. Step 6: Final answer
   x = 1,047,147.80