Finding the Fourth Proportional to 1,410.72, 2,112.48 and 978.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,410.72 : 2,112.48 = 978.72 : x
2. Step 2: Convert to fraction form
   1,410.72/2,112.48 = 978.72/x
3. Step 3: Cross multiply
   1,410.72x = 2,112.48 × 978.72
4. Step 4: Simplify right side
   1,410.72x = 2,067,526.43
5. Step 5: Solve for x
   x = 2,067,526.43/1,410.72
6. Step 6: Final answer
   x = 1,465.58