Finding the Fourth Proportional to 1,393.20, 2,090.88 and 1,200.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.20 : 2,090.88 = 1,200.42 : x
2. Step 2: Convert to fraction form
   1,393.20/2,090.88 = 1,200.42/x
3. Step 3: Cross multiply
   1,393.20x = 2,090.88 × 1,200.42
4. Step 4: Simplify right side
   1,393.20x = 2,509,934.17
5. Step 5: Solve for x
   x = 2,509,934.17/1,393.20
6. Step 6: Final answer
   x = 1,801.56