Finding the Fourth Proportional to 1,200.81, 1,654.50 and 807.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.81 : 1,654.50 = 807.15 : x
2. Step 2: Convert to fraction form
   1,200.81/1,654.50 = 807.15/x
3. Step 3: Cross multiply
   1,200.81x = 1,654.50 × 807.15
4. Step 4: Simplify right side
   1,200.81x = 1,335,429.68
5. Step 5: Solve for x
   x = 1,335,429.68/1,200.81
6. Step 6: Final answer
   x = 1,112.11