Finding the Third Proportional to 553,863 and 829,870.50

Step by Step Solution

1. Step 1: Write the proportion equation
   553,863 : 829,870.50 = 829,870.50 : x
2. Step 2: Convert to fraction form
   553,863/829,870.50 = 829,870.50/x
3. Step 3: Cross multiply
   553,863x = 829,870.50 × 829,870.50
4. Step 4: Simplify right side
   553,863x = 688,685,046,770.25
5. Step 5: Solve for x
   x = 688,685,046,770.25/553,863
6. Step 6: Final answer
   x = 1,243,421.29