Finding the Third Proportional to 119,861.50 and 258,404

Step by Step Solution

1. Step 1: Write the proportion equation
   119,861.50 : 258,404 = 258,404 : x
2. Step 2: Convert to fraction form
   119,861.50/258,404 = 258,404/x
3. Step 3: Cross multiply
   119,861.50x = 258,404 × 258,404
4. Step 4: Simplify right side
   119,861.50x = 66,772,627,216
5. Step 5: Solve for x
   x = 66,772,627,216/119,861.50
6. Step 6: Final answer
   x = 557,081.53