Finding the Third Proportional to 551,105 and 780,028

Step by Step Solution

1. Step 1: Write the proportion equation
   551,105 : 780,028 = 780,028 : x
2. Step 2: Convert to fraction form
   551,105/780,028 = 780,028/x
3. Step 3: Cross multiply
   551,105x = 780,028 × 780,028
4. Step 4: Simplify right side
   551,105x = 608,443,680,784
5. Step 5: Solve for x
   x = 608,443,680,784/551,105
6. Step 6: Final answer
   x = 1,104,043.11