Finding the Third Proportional to 258,783.50 and 563,129

Step by Step Solution

1. Step 1: Write the proportion equation
   258,783.50 : 563,129 = 563,129 : x
2. Step 2: Convert to fraction form
   258,783.50/563,129 = 563,129/x
3. Step 3: Cross multiply
   258,783.50x = 563,129 × 563,129
4. Step 4: Simplify right side
   258,783.50x = 317,114,270,641
5. Step 5: Solve for x
   x = 317,114,270,641/258,783.50
6. Step 6: Final answer
   x = 1,225,403.75