Finding the Fourth Proportional to 3,321.18, 4,980.72 and 1,129.41

Step by Step Solution

1. Step 1: Write the proportion equation
   3,321.18 : 4,980.72 = 1,129.41 : x
2. Step 2: Convert to fraction form
   3,321.18/4,980.72 = 1,129.41/x
3. Step 3: Cross multiply
   3,321.18x = 4,980.72 × 1,129.41
4. Step 4: Simplify right side
   3,321.18x = 5,625,274.98
5. Step 5: Solve for x
   x = 5,625,274.98/3,321.18
6. Step 6: Final answer
   x = 1,693.76