Finding the Third Proportional to 978,271.50 and 1,286,421

Step by Step Solution

1. Step 1: Write the proportion equation
   978,271.50 : 1,286,421 = 1,286,421 : x
2. Step 2: Convert to fraction form
   978,271.50/1,286,421 = 1,286,421/x
3. Step 3: Cross multiply
   978,271.50x = 1,286,421 × 1,286,421
4. Step 4: Simplify right side
   978,271.50x = 1,654,878,989,241
5. Step 5: Solve for x
   x = 1,654,878,989,241/978,271.50
6. Step 6: Final answer
   x = 1,691,635.70