Finding the Fourth Proportional to 994.41, 1,374.94 and 978.82

Step by Step Solution

1. Step 1: Write the proportion equation
   994.41 : 1,374.94 = 978.82 : x
2. Step 2: Convert to fraction form
   994.41/1,374.94 = 978.82/x
3. Step 3: Cross multiply
   994.41x = 1,374.94 × 978.82
4. Step 4: Simplify right side
   994.41x = 1,345,816.56
5. Step 5: Solve for x
   x = 1,345,816.56/994.41
6. Step 6: Final answer
   x = 1,353.38