Finding the Third Proportional to 258,913.50 and 555,123

Step by Step Solution

1. Step 1: Write the proportion equation
   258,913.50 : 555,123 = 555,123 : x
2. Step 2: Convert to fraction form
   258,913.50/555,123 = 555,123/x
3. Step 3: Cross multiply
   258,913.50x = 555,123 × 555,123
4. Step 4: Simplify right side
   258,913.50x = 308,161,545,129
5. Step 5: Solve for x
   x = 308,161,545,129/258,913.50
6. Step 6: Final answer
   x = 1,190,210.42