Finding the Fourth Proportional to 1,059.41, 1,581.77 and 993.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.41 : 1,581.77 = 993.80 : x
2. Step 2: Convert to fraction form
   1,059.41/1,581.77 = 993.80/x
3. Step 3: Cross multiply
   1,059.41x = 1,581.77 × 993.80
4. Step 4: Simplify right side
   1,059.41x = 1,571,950.15
5. Step 5: Solve for x
   x = 1,571,950.15/1,059.41
6. Step 6: Final answer
   x = 1,483.80