Finding the Fourth Proportional to 3,880.91, 5,820.37 and 1,247.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,880.91 : 5,820.37 = 1,247.87 : x
2. Step 2: Convert to fraction form
   3,880.91/5,820.37 = 1,247.87/x
3. Step 3: Cross multiply
   3,880.91x = 5,820.37 × 1,247.87
4. Step 4: Simplify right side
   3,880.91x = 7,263,032.89
5. Step 5: Solve for x
   x = 7,263,032.89/3,880.91
6. Step 6: Final answer
   x = 1,871.48