Finding the Fourth Proportional to 3,869.10, 5,803.56 and 947.39

Step by Step Solution

1. Step 1: Write the proportion equation
   3,869.10 : 5,803.56 = 947.39 : x
2. Step 2: Convert to fraction form
   3,869.10/5,803.56 = 947.39/x
3. Step 3: Cross multiply
   3,869.10x = 5,803.56 × 947.39
4. Step 4: Simplify right side
   3,869.10x = 5,498,205.69
5. Step 5: Solve for x
   x = 5,498,205.69/3,869.10
6. Step 6: Final answer
   x = 1,421.06