Finding the Fourth Proportional to 978.84, 1,351.98 and 849.47

Step by Step Solution

1. Step 1: Write the proportion equation
   978.84 : 1,351.98 = 849.47 : x
2. Step 2: Convert to fraction form
   978.84/1,351.98 = 849.47/x
3. Step 3: Cross multiply
   978.84x = 1,351.98 × 849.47
4. Step 4: Simplify right side
   978.84x = 1,148,459.69
5. Step 5: Solve for x
   x = 1,148,459.69/978.84
6. Step 6: Final answer
   x = 1,173.29