Finding the Third Proportional to 258,919.50 and 553,818

Step by Step Solution

1. Step 1: Write the proportion equation
   258,919.50 : 553,818 = 553,818 : x
2. Step 2: Convert to fraction form
   258,919.50/553,818 = 553,818/x
3. Step 3: Cross multiply
   258,919.50x = 553,818 × 553,818
4. Step 4: Simplify right side
   258,919.50x = 306,714,377,124
5. Step 5: Solve for x
   x = 306,714,377,124/258,919.50
6. Step 6: Final answer
   x = 1,184,593.58