Finding the Fourth Proportional to 1,107.55, 1,662.23 and 978.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,107.55 : 1,662.23 = 978.76 : x
2. Step 2: Convert to fraction form
   1,107.55/1,662.23 = 978.76/x
3. Step 3: Cross multiply
   1,107.55x = 1,662.23 × 978.76
4. Step 4: Simplify right side
   1,107.55x = 1,626,922.53
5. Step 5: Solve for x
   x = 1,626,922.53/1,107.55
6. Step 6: Final answer
   x = 1,468.94