Finding the Fourth Proportional to 1,764.90, 2,435.56 and 978.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,764.90 : 2,435.56 = 978.95 : x
2. Step 2: Convert to fraction form
   1,764.90/2,435.56 = 978.95/x
3. Step 3: Cross multiply
   1,764.90x = 2,435.56 × 978.95
4. Step 4: Simplify right side
   1,764.90x = 2,384,274.39
5. Step 5: Solve for x
   x = 2,384,274.39/1,764.90
6. Step 6: Final answer
   x = 1,350.94