Finding the Fourth Proportional to 3,784.26, 5,677.20 and 1,321.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,784.26 : 5,677.20 = 1,321.05 : x
2. Step 2: Convert to fraction form
   3,784.26/5,677.20 = 1,321.05/x
3. Step 3: Cross multiply
   3,784.26x = 5,677.20 × 1,321.05
4. Step 4: Simplify right side
   3,784.26x = 7,499,865.06
5. Step 5: Solve for x
   x = 7,499,865.06/3,784.26
6. Step 6: Final answer
   x = 1,981.86