Finding the Fourth Proportional to 1,711.51, 2,563.12 and 978.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,711.51 : 2,563.12 = 978.86 : x
2. Step 2: Convert to fraction form
   1,711.51/2,563.12 = 978.86/x
3. Step 3: Cross multiply
   1,711.51x = 2,563.12 × 978.86
4. Step 4: Simplify right side
   1,711.51x = 2,508,943.27
5. Step 5: Solve for x
   x = 2,508,943.27/1,711.51
6. Step 6: Final answer
   x = 1,465.93