Finding the Fourth Proportional to 1,613.06, 2,419.25 and 790.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,613.06 : 2,419.25 = 790.50 : x
2. Step 2: Convert to fraction form
   1,613.06/2,419.25 = 790.50/x
3. Step 3: Cross multiply
   1,613.06x = 2,419.25 × 790.50
4. Step 4: Simplify right side
   1,613.06x = 1,912,413.17
5. Step 5: Solve for x
   x = 1,912,413.17/1,613.06
6. Step 6: Final answer
   x = 1,185.58