Finding the Fourth Proportional to 1,393.83, 1,924.92 and 1,206.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.83 : 1,924.92 = 1,206.42 : x
2. Step 2: Convert to fraction form
   1,393.83/1,924.92 = 1,206.42/x
3. Step 3: Cross multiply
   1,393.83x = 1,924.92 × 1,206.42
4. Step 4: Simplify right side
   1,393.83x = 2,322,261.99
5. Step 5: Solve for x
   x = 2,322,261.99/1,393.83
6. Step 6: Final answer
   x = 1,666.10