Finding the Fourth Proportional to 3,460.21, 5,189.55 and 1,120.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,460.21 : 5,189.55 = 1,120.42 : x
2. Step 2: Convert to fraction form
   3,460.21/5,189.55 = 1,120.42/x
3. Step 3: Cross multiply
   3,460.21x = 5,189.55 × 1,120.42
4. Step 4: Simplify right side
   3,460.21x = 5,814,475.61
5. Step 5: Solve for x
   x = 5,814,475.61/3,460.21
6. Step 6: Final answer
   x = 1,680.38