Finding the Third Proportional to 258,360 and 554,089.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,360 : 554,089.50 = 554,089.50 : x
2. Step 2: Convert to fraction form
   258,360/554,089.50 = 554,089.50/x
3. Step 3: Cross multiply
   258,360x = 554,089.50 × 554,089.50
4. Step 4: Simplify right side
   258,360x = 307,015,174,010.25
5. Step 5: Solve for x
   x = 307,015,174,010.25/258,360
6. Step 6: Final answer
   x = 1,188,323.17