Finding the Fourth Proportional to 1,978.65, 2,967.93 and 808.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.65 : 2,967.93 = 808.38 : x
2. Step 2: Convert to fraction form
   1,978.65/2,967.93 = 808.38/x
3. Step 3: Cross multiply
   1,978.65x = 2,967.93 × 808.38
4. Step 4: Simplify right side
   1,978.65x = 2,399,215.25
5. Step 5: Solve for x
   x = 2,399,215.25/1,978.65
6. Step 6: Final answer
   x = 1,212.55