Finding the Fourth Proportional to 978.86, 1,353.84 and 962.45

Step by Step Solution

1. Step 1: Write the proportion equation
   978.86 : 1,353.84 = 962.45 : x
2. Step 2: Convert to fraction form
   978.86/1,353.84 = 962.45/x
3. Step 3: Cross multiply
   978.86x = 1,353.84 × 962.45
4. Step 4: Simplify right side
   978.86x = 1,303,003.31
5. Step 5: Solve for x
   x = 1,303,003.31/978.86
6. Step 6: Final answer
   x = 1,331.14