Finding the Fourth Proportional to 978.99, 1,347.62 and 846.15

Step by Step Solution

1. Step 1: Write the proportion equation
   978.99 : 1,347.62 = 846.15 : x
2. Step 2: Convert to fraction form
   978.99/1,347.62 = 846.15/x
3. Step 3: Cross multiply
   978.99x = 1,347.62 × 846.15
4. Step 4: Simplify right side
   978.99x = 1,140,284.43
5. Step 5: Solve for x
   x = 1,140,284.43/978.99
6. Step 6: Final answer
   x = 1,164.76