Finding the Fourth Proportional to 1,764.17, 2,434.58 and 978.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.17 : 2,434.58 = 978.23 : x
2. Step 2: Convert to fraction form
   1,764.17/2,434.58 = 978.23/x
3. Step 3: Cross multiply
   1,764.17x = 2,434.58 × 978.23
4. Step 4: Simplify right side
   1,764.17x = 2,381,574.30
5. Step 5: Solve for x
   x = 2,381,574.30/1,764.17
6. Step 6: Final answer
   x = 1,349.97