Finding the Third Proportional to 645,970.50 and 991,557

Step by Step Solution

1. Step 1: Write the proportion equation
   645,970.50 : 991,557 = 991,557 : x
2. Step 2: Convert to fraction form
   645,970.50/991,557 = 991,557/x
3. Step 3: Cross multiply
   645,970.50x = 991,557 × 991,557
4. Step 4: Simplify right side
   645,970.50x = 983,185,284,249
5. Step 5: Solve for x
   x = 983,185,284,249/645,970.50
6. Step 6: Final answer
   x = 1,522,028.15