Finding the Third Proportional to 553,617 and 830,425.50

Step by Step Solution

1. Step 1: Write the proportion equation
   553,617 : 830,425.50 = 830,425.50 : x
2. Step 2: Convert to fraction form
   553,617/830,425.50 = 830,425.50/x
3. Step 3: Cross multiply
   553,617x = 830,425.50 × 830,425.50
4. Step 4: Simplify right side
   553,617x = 689,606,511,050.25
5. Step 5: Solve for x
   x = 689,606,511,050.25/553,617
6. Step 6: Final answer
   x = 1,245,638.25