Finding the Fourth Proportional to 2,781.86, 4,173.95 and 1,221.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,781.86 : 4,173.95 = 1,221.05 : x
2. Step 2: Convert to fraction form
   2,781.86/4,173.95 = 1,221.05/x
3. Step 3: Cross multiply
   2,781.86x = 4,173.95 × 1,221.05
4. Step 4: Simplify right side
   2,781.86x = 5,096,601.65
5. Step 5: Solve for x
   x = 5,096,601.65/2,781.86
6. Step 6: Final answer
   x = 1,832.08