Finding the Third Proportional to 238,920 and 521,616

Step by Step Solution

1. Step 1: Write the proportion equation
   238,920 : 521,616 = 521,616 : x
2. Step 2: Convert to fraction form
   238,920/521,616 = 521,616/x
3. Step 3: Cross multiply
   238,920x = 521,616 × 521,616
4. Step 4: Simplify right side
   238,920x = 272,083,251,456
5. Step 5: Solve for x
   x = 272,083,251,456/238,920
6. Step 6: Final answer
   x = 1,138,804.84