Finding the Fourth Proportional to 3,980.43, 5,970.69 and 1,059.03

Step by Step Solution

1. Step 1: Write the proportion equation
   3,980.43 : 5,970.69 = 1,059.03 : x
2. Step 2: Convert to fraction form
   3,980.43/5,970.69 = 1,059.03/x
3. Step 3: Cross multiply
   3,980.43x = 5,970.69 × 1,059.03
4. Step 4: Simplify right side
   3,980.43x = 6,323,139.83
5. Step 5: Solve for x
   x = 6,323,139.83/3,980.43
6. Step 6: Final answer
   x = 1,588.56