Finding the Fourth Proportional to 1,724.81, 2,380.36 and 978.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,724.81 : 2,380.36 = 978.77 : x
2. Step 2: Convert to fraction form
   1,724.81/2,380.36 = 978.77/x
3. Step 3: Cross multiply
   1,724.81x = 2,380.36 × 978.77
4. Step 4: Simplify right side
   1,724.81x = 2,329,828.46
5. Step 5: Solve for x
   x = 2,329,828.46/1,724.81
6. Step 6: Final answer
   x = 1,350.77