Finding the Fourth Proportional to 1,978.41, 2,967.58 and 808.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.41 : 2,967.58 = 808.40 : x
2. Step 2: Convert to fraction form
   1,978.41/2,967.58 = 808.40/x
3. Step 3: Cross multiply
   1,978.41x = 2,967.58 × 808.40
4. Step 4: Simplify right side
   1,978.41x = 2,398,991.67
5. Step 5: Solve for x
   x = 2,398,991.67/1,978.41
6. Step 6: Final answer
   x = 1,212.59