Finding the Fourth Proportional to 2,073.72, 3,111.66 and 842.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,073.72 : 3,111.66 = 842.04 : x
2. Step 2: Convert to fraction form
   2,073.72/3,111.66 = 842.04/x
3. Step 3: Cross multiply
   2,073.72x = 3,111.66 × 842.04
4. Step 4: Simplify right side
   2,073.72x = 2,620,142.19
5. Step 5: Solve for x
   x = 2,620,142.19/2,073.72
6. Step 6: Final answer
   x = 1,263.50