Finding the Third Proportional to 238,916 and 521,608

Step by Step Solution

1. Step 1: Write the proportion equation
   238,916 : 521,608 = 521,608 : x
2. Step 2: Convert to fraction form
   238,916/521,608 = 521,608/x
3. Step 3: Cross multiply
   238,916x = 521,608 × 521,608
4. Step 4: Simplify right side
   238,916x = 272,074,905,664
5. Step 5: Solve for x
   x = 272,074,905,664/238,916
6. Step 6: Final answer
   x = 1,138,788.97