Finding the Fourth Proportional to 3,420.44, 5,131.46 and 1,111.94

Step by Step Solution

1. Step 1: Write the proportion equation
   3,420.44 : 5,131.46 = 1,111.94 : x
2. Step 2: Convert to fraction form
   3,420.44/5,131.46 = 1,111.94/x
3. Step 3: Cross multiply
   3,420.44x = 5,131.46 × 1,111.94
4. Step 4: Simplify right side
   3,420.44x = 5,705,875.63
5. Step 5: Solve for x
   x = 5,705,875.63/3,420.44
6. Step 6: Final answer
   x = 1,668.17