Finding the Fourth Proportional to 1,394.69, 1,924.76 and 805.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,394.69 : 1,924.76 = 805.21 : x
2. Step 2: Convert to fraction form
   1,394.69/1,924.76 = 805.21/x
3. Step 3: Cross multiply
   1,394.69x = 1,924.76 × 805.21
4. Step 4: Simplify right side
   1,394.69x = 1,549,822.35
5. Step 5: Solve for x
   x = 1,549,822.35/1,394.69
6. Step 6: Final answer
   x = 1,111.23