Finding the Third Proportional to 260,817 and 553,618.50

Step by Step Solution

1. Step 1: Write the proportion equation
   260,817 : 553,618.50 = 553,618.50 : x
2. Step 2: Convert to fraction form
   260,817/553,618.50 = 553,618.50/x
3. Step 3: Cross multiply
   260,817x = 553,618.50 × 553,618.50
4. Step 4: Simplify right side
   260,817x = 306,493,443,542.25
5. Step 5: Solve for x
   x = 306,493,443,542.25/260,817
6. Step 6: Final answer
   x = 1,175,128.32