Finding the Fourth Proportional to 1,397.99, 1,929.38 and 808.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,397.99 : 1,929.38 = 808.50 : x
2. Step 2: Convert to fraction form
   1,397.99/1,929.38 = 808.50/x
3. Step 3: Cross multiply
   1,397.99x = 1,929.38 × 808.50
4. Step 4: Simplify right side
   1,397.99x = 1,559,899.69
5. Step 5: Solve for x
   x = 1,559,899.69/1,397.99
6. Step 6: Final answer
   x = 1,115.82