Finding the Third Proportional to 478,608 and 740,990

Step by Step Solution

1. Step 1: Write the proportion equation
   478,608 : 740,990 = 740,990 : x
2. Step 2: Convert to fraction form
   478,608/740,990 = 740,990/x
3. Step 3: Cross multiply
   478,608x = 740,990 × 740,990
4. Step 4: Simplify right side
   478,608x = 549,066,180,100
5. Step 5: Solve for x
   x = 549,066,180,100/478,608
6. Step 6: Final answer
   x = 1,147,214.80