Finding the Fourth Proportional to 1,200.42, 1,656.72 and 808.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.42 : 1,656.72 = 808.38 : x
2. Step 2: Convert to fraction form
   1,200.42/1,656.72 = 808.38/x
3. Step 3: Cross multiply
   1,200.42x = 1,656.72 × 808.38
4. Step 4: Simplify right side
   1,200.42x = 1,339,259.31
5. Step 5: Solve for x
   x = 1,339,259.31/1,200.42
6. Step 6: Final answer
   x = 1,115.66