Finding the Fourth Proportional to 1,321.61, 1,978.37 and 1,182.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.61 : 1,978.37 = 1,182.83 : x
2. Step 2: Convert to fraction form
   1,321.61/1,978.37 = 1,182.83/x
3. Step 3: Cross multiply
   1,321.61x = 1,978.37 × 1,182.83
4. Step 4: Simplify right side
   1,321.61x = 2,340,069.47
5. Step 5: Solve for x
   x = 2,340,069.47/1,321.61
6. Step 6: Final answer
   x = 1,770.62