Finding the Fourth Proportional to 978.97, 1,475.34 and 881.59

Step by Step Solution

1. Step 1: Write the proportion equation
   978.97 : 1,475.34 = 881.59 : x
2. Step 2: Convert to fraction form
   978.97/1,475.34 = 881.59/x
3. Step 3: Cross multiply
   978.97x = 1,475.34 × 881.59
4. Step 4: Simplify right side
   978.97x = 1,300,644.99
5. Step 5: Solve for x
   x = 1,300,644.99/978.97
6. Step 6: Final answer
   x = 1,328.59