Finding the Third Proportional to 478,760 and 728,090

Step by Step Solution

1. Step 1: Write the proportion equation
   478,760 : 728,090 = 728,090 : x
2. Step 2: Convert to fraction form
   478,760/728,090 = 728,090/x
3. Step 3: Cross multiply
   478,760x = 728,090 × 728,090
4. Step 4: Simplify right side
   478,760x = 530,115,048,100
5. Step 5: Solve for x
   x = 530,115,048,100/478,760
6. Step 6: Final answer
   x = 1,107,266.79