Finding the Third Proportional to 259,510.50 and 557,820

Step by Step Solution

1. Step 1: Write the proportion equation
   259,510.50 : 557,820 = 557,820 : x
2. Step 2: Convert to fraction form
   259,510.50/557,820 = 557,820/x
3. Step 3: Cross multiply
   259,510.50x = 557,820 × 557,820
4. Step 4: Simplify right side
   259,510.50x = 311,163,152,400
5. Step 5: Solve for x
   x = 311,163,152,400/259,510.50
6. Step 6: Final answer
   x = 1,199,038.78