Finding the Fourth Proportional to 978.27, 1,459.98 and 938.58

Step by Step Solution

1. Step 1: Write the proportion equation
   978.27 : 1,459.98 = 938.58 : x
2. Step 2: Convert to fraction form
   978.27/1,459.98 = 938.58/x
3. Step 3: Cross multiply
   978.27x = 1,459.98 × 938.58
4. Step 4: Simplify right side
   978.27x = 1,370,308.03
5. Step 5: Solve for x
   x = 1,370,308.03/978.27
6. Step 6: Final answer
   x = 1,400.75