Finding the Fourth Proportional to 1,373.40, 1,894.74 and 842.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,373.40 : 1,894.74 = 842.12 : x
2. Step 2: Convert to fraction form
   1,373.40/1,894.74 = 842.12/x
3. Step 3: Cross multiply
   1,373.40x = 1,894.74 × 842.12
4. Step 4: Simplify right side
   1,373.40x = 1,595,598.45
5. Step 5: Solve for x
   x = 1,595,598.45/1,373.40
6. Step 6: Final answer
   x = 1,161.79