Finding the Fourth Proportional to 1,764.20, 2,434.36 and 978.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.20 : 2,434.36 = 978.09 : x
2. Step 2: Convert to fraction form
   1,764.20/2,434.36 = 978.09/x
3. Step 3: Cross multiply
   1,764.20x = 2,434.36 × 978.09
4. Step 4: Simplify right side
   1,764.20x = 2,381,023.17
5. Step 5: Solve for x
   x = 2,381,023.17/1,764.20
6. Step 6: Final answer
   x = 1,349.63