Finding the Fourth Proportional to 1,388.83, 1,918.02 and 1,201.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.83 : 1,918.02 = 1,201.42 : x
2. Step 2: Convert to fraction form
   1,388.83/1,918.02 = 1,201.42/x
3. Step 3: Cross multiply
   1,388.83x = 1,918.02 × 1,201.42
4. Step 4: Simplify right side
   1,388.83x = 2,304,347.59
5. Step 5: Solve for x
   x = 2,304,347.59/1,388.83
6. Step 6: Final answer
   x = 1,659.20