Finding the Fourth Proportional to 1,411.38, 2,118.29 and 978.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,411.38 : 2,118.29 = 978.84 : x
2. Step 2: Convert to fraction form
   1,411.38/2,118.29 = 978.84/x
3. Step 3: Cross multiply
   1,411.38x = 2,118.29 × 978.84
4. Step 4: Simplify right side
   1,411.38x = 2,073,462.09
5. Step 5: Solve for x
   x = 2,073,462.09/1,411.38
6. Step 6: Final answer
   x = 1,469.10