Finding the Fourth Proportional to 1,098.55, 1,645.38 and 789.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,098.55 : 1,645.38 = 789.47 : x
2. Step 2: Convert to fraction form
   1,098.55/1,645.38 = 789.47/x
3. Step 3: Cross multiply
   1,098.55x = 1,645.38 × 789.47
4. Step 4: Simplify right side
   1,098.55x = 1,298,978.15
5. Step 5: Solve for x
   x = 1,298,978.15/1,098.55
6. Step 6: Final answer
   x = 1,182.45