Finding the Fourth Proportional to 1,978.98, 2,969.62 and 808.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.98 : 2,969.62 = 808.80 : x
2. Step 2: Convert to fraction form
   1,978.98/2,969.62 = 808.80/x
3. Step 3: Cross multiply
   1,978.98x = 2,969.62 × 808.80
4. Step 4: Simplify right side
   1,978.98x = 2,401,828.66
5. Step 5: Solve for x
   x = 2,401,828.66/1,978.98
6. Step 6: Final answer
   x = 1,213.67