Finding the Third Proportional to 561,326 and 879,542.50

Step by Step Solution

1. Step 1: Write the proportion equation
   561,326 : 879,542.50 = 879,542.50 : x
2. Step 2: Convert to fraction form
   561,326/879,542.50 = 879,542.50/x
3. Step 3: Cross multiply
   561,326x = 879,542.50 × 879,542.50
4. Step 4: Simplify right side
   561,326x = 773,595,009,306.25
5. Step 5: Solve for x
   x = 773,595,009,306.25/561,326
6. Step 6: Final answer
   x = 1,378,156.38