Finding the Fourth Proportional to 3,342.20, 5,012.56 and 1,121.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,342.20 : 5,012.56 = 1,121.34 : x
2. Step 2: Convert to fraction form
   3,342.20/5,012.56 = 1,121.34/x
3. Step 3: Cross multiply
   3,342.20x = 5,012.56 × 1,121.34
4. Step 4: Simplify right side
   3,342.20x = 5,620,781.23
5. Step 5: Solve for x
   x = 5,620,781.23/3,342.20
6. Step 6: Final answer
   x = 1,681.76