Finding the Third Proportional to 561,475.50 and 863,899.50

Step by Step Solution

1. Step 1: Write the proportion equation
   561,475.50 : 863,899.50 = 863,899.50 : x
2. Step 2: Convert to fraction form
   561,475.50/863,899.50 = 863,899.50/x
3. Step 3: Cross multiply
   561,475.50x = 863,899.50 × 863,899.50
4. Step 4: Simplify right side
   561,475.50x = 746,322,346,100.25
5. Step 5: Solve for x
   x = 746,322,346,100.25/561,475.50
6. Step 6: Final answer
   x = 1,329,216.23