Finding the Fourth Proportional to 1,429.78, 1,973.04 and 808.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.78 : 1,973.04 = 808.78 : x
2. Step 2: Convert to fraction form
   1,429.78/1,973.04 = 808.78/x
3. Step 3: Cross multiply
   1,429.78x = 1,973.04 × 808.78
4. Step 4: Simplify right side
   1,429.78x = 1,595,755.29
5. Step 5: Solve for x
   x = 1,595,755.29/1,429.78
6. Step 6: Final answer
   x = 1,116.08