Finding the Third Proportional to 428,280 and 915,824

Step by Step Solution

1. Step 1: Write the proportion equation
   428,280 : 915,824 = 915,824 : x
2. Step 2: Convert to fraction form
   428,280/915,824 = 915,824/x
3. Step 3: Cross multiply
   428,280x = 915,824 × 915,824
4. Step 4: Simplify right side
   428,280x = 838,733,598,976
5. Step 5: Solve for x
   x = 838,733,598,976/428,280
6. Step 6: Final answer
   x = 1,958,376.76