Finding the Fourth Proportional to 978.82, 1,350.80 and 580.69

Step by Step Solution

1. Step 1: Write the proportion equation
   978.82 : 1,350.80 = 580.69 : x
2. Step 2: Convert to fraction form
   978.82/1,350.80 = 580.69/x
3. Step 3: Cross multiply
   978.82x = 1,350.80 × 580.69
4. Step 4: Simplify right side
   978.82x = 784,393.98
5. Step 5: Solve for x
   x = 784,393.98/978.82
6. Step 6: Final answer
   x = 801.37