Finding the Fourth Proportional to 1,099.50, 1,646.38 and 879.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,099.50 : 1,646.38 = 879.12 : x
2. Step 2: Convert to fraction form
   1,099.50/1,646.38 = 879.12/x
3. Step 3: Cross multiply
   1,099.50x = 1,646.38 × 879.12
4. Step 4: Simplify right side
   1,099.50x = 1,447,365.59
5. Step 5: Solve for x
   x = 1,447,365.59/1,099.50
6. Step 6: Final answer
   x = 1,316.39