Finding the Fourth Proportional to 978,064.80, 1,465,128.90 and 659,200.20

Step by Step Solution

1. Step 1: Write the proportion equation
   978,064.80 : 1,465,128.90 = 659,200.20 : x
2. Step 2: Convert to fraction form
   978,064.80/1,465,128.90 = 659,200.20/x
3. Step 3: Cross multiply
   978,064.80x = 1,465,128.90 × 659,200.20
4. Step 4: Simplify right side
   978,064.80x = 965,813,263,905.78
5. Step 5: Solve for x
   x = 965,813,263,905.78/978,064.80
6. Step 6: Final answer
   x = 987,473.70