Finding the Fourth Proportional to 1,011.12, 1,518.03 and 978.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.12 : 1,518.03 = 978.32 : x
2. Step 2: Convert to fraction form
   1,011.12/1,518.03 = 978.32/x
3. Step 3: Cross multiply
   1,011.12x = 1,518.03 × 978.32
4. Step 4: Simplify right side
   1,011.12x = 1,485,111.52
5. Step 5: Solve for x
   x = 1,485,111.52/1,011.12
6. Step 6: Final answer
   x = 1,468.78