Finding the Fourth Proportional to 3,875.70, 5,811.81 and 1,242.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,875.70 : 5,811.81 = 1,242.72 : x
2. Step 2: Convert to fraction form
   3,875.70/5,811.81 = 1,242.72/x
3. Step 3: Cross multiply
   3,875.70x = 5,811.81 × 1,242.72
4. Step 4: Simplify right side
   3,875.70x = 7,222,452.52
5. Step 5: Solve for x
   x = 7,222,452.52/3,875.70
6. Step 6: Final answer
   x = 1,863.52