Finding the Fourth Proportional to 3,861.42, 5,790.08 and 1,780.35

Step by Step Solution

1. Step 1: Write the proportion equation
   3,861.42 : 5,790.08 = 1,780.35 : x
2. Step 2: Convert to fraction form
   3,861.42/5,790.08 = 1,780.35/x
3. Step 3: Cross multiply
   3,861.42x = 5,790.08 × 1,780.35
4. Step 4: Simplify right side
   3,861.42x = 10,308,400.52
5. Step 5: Solve for x
   x = 10,308,400.52/3,861.42
6. Step 6: Final answer
   x = 2,669.59