Finding the Third Proportional to 258,120 and 553,618.50

Step by Step Solution

1. Step 1: Write the proportion equation
   258,120 : 553,618.50 = 553,618.50 : x
2. Step 2: Convert to fraction form
   258,120/553,618.50 = 553,618.50/x
3. Step 3: Cross multiply
   258,120x = 553,618.50 × 553,618.50
4. Step 4: Simplify right side
   258,120x = 306,493,443,542.25
5. Step 5: Solve for x
   x = 306,493,443,542.25/258,120
6. Step 6: Final answer
   x = 1,187,406.80