Finding the Fourth Proportional to 2,132.72, 3,200.28 and 978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,132.72 : 3,200.28 = 978.56 : x
2. Step 2: Convert to fraction form
   2,132.72/3,200.28 = 978.56/x
3. Step 3: Cross multiply
   2,132.72x = 3,200.28 × 978.56
4. Step 4: Simplify right side
   2,132.72x = 3,131,666.00
5. Step 5: Solve for x
   x = 3,131,666.00/2,132.72
6. Step 6: Final answer
   x = 1,468.39