Finding the Third Proportional to 787,128 and 1,688,928

Step by Step Solution

1. Step 1: Write the proportion equation
   787,128 : 1,688,928 = 1,688,928 : x
2. Step 2: Convert to fraction form
   787,128/1,688,928 = 1,688,928/x
3. Step 3: Cross multiply
   787,128x = 1,688,928 × 1,688,928
4. Step 4: Simplify right side
   787,128x = 2,852,477,789,184
5. Step 5: Solve for x
   x = 2,852,477,789,184/787,128
6. Step 6: Final answer
   x = 3,623,905.88