Finding the Third Proportional to 815,264 and 1,688,128

Step by Step Solution

1. Step 1: Write the proportion equation
   815,264 : 1,688,128 = 1,688,128 : x
2. Step 2: Convert to fraction form
   815,264/1,688,128 = 1,688,128/x
3. Step 3: Cross multiply
   815,264x = 1,688,128 × 1,688,128
4. Step 4: Simplify right side
   815,264x = 2,849,776,144,384
5. Step 5: Solve for x
   x = 2,849,776,144,384/815,264
6. Step 6: Final answer
   x = 3,495,525.55