Finding the Third Proportional to 815,272 and 1,688,144

Step by Step Solution

1. Step 1: Write the proportion equation
   815,272 : 1,688,144 = 1,688,144 : x
2. Step 2: Convert to fraction form
   815,272/1,688,144 = 1,688,144/x
3. Step 3: Cross multiply
   815,272x = 1,688,144 × 1,688,144
4. Step 4: Simplify right side
   815,272x = 2,849,830,164,736
5. Step 5: Solve for x
   x = 2,849,830,164,736/815,272
6. Step 6: Final answer
   x = 3,495,557.51