Finding the Fourth Proportional to 1,349.86, 2,020.82 and 1,209.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,349.86 : 2,020.82 = 1,209.12 : x
2. Step 2: Convert to fraction form
   1,349.86/2,020.82 = 1,209.12/x
3. Step 3: Cross multiply
   1,349.86x = 2,020.82 × 1,209.12
4. Step 4: Simplify right side
   1,349.86x = 2,443,413.88
5. Step 5: Solve for x
   x = 2,443,413.88/1,349.86
6. Step 6: Final answer
   x = 1,810.12