Finding the Third Proportional to 215,360 and 320,938

Step by Step Solution

1. Step 1: Write the proportion equation
   215,360 : 320,938 = 320,938 : x
2. Step 2: Convert to fraction form
   215,360/320,938 = 320,938/x
3. Step 3: Cross multiply
   215,360x = 320,938 × 320,938
4. Step 4: Simplify right side
   215,360x = 103,001,199,844
5. Step 5: Solve for x
   x = 103,001,199,844/215,360
6. Step 6: Final answer
   x = 478,274.52