Finding the Fourth Proportional to 3,854.07, 5,780.86 and 1,221.52

Step by Step Solution

1. Step 1: Write the proportion equation
   3,854.07 : 5,780.86 = 1,221.52 : x
2. Step 2: Convert to fraction form
   3,854.07/5,780.86 = 1,221.52/x
3. Step 3: Cross multiply
   3,854.07x = 5,780.86 × 1,221.52
4. Step 4: Simplify right side
   3,854.07x = 7,061,410.45
5. Step 5: Solve for x
   x = 7,061,410.45/3,854.07
6. Step 6: Final answer
   x = 1,832.19