Finding the Fourth Proportional to 1,764.15, 2,434.59 and 978.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.15 : 2,434.59 = 978.20 : x
2. Step 2: Convert to fraction form
   1,764.15/2,434.59 = 978.20/x
3. Step 3: Cross multiply
   1,764.15x = 2,434.59 × 978.20
4. Step 4: Simplify right side
   1,764.15x = 2,381,503.77
5. Step 5: Solve for x
   x = 2,381,503.77/1,764.15
6. Step 6: Final answer
   x = 1,349.94