Finding the Fourth Proportional to 3,869.28, 5,803.83 and 947.57

Step by Step Solution

1. Step 1: Write the proportion equation
   3,869.28 : 5,803.83 = 947.57 : x
2. Step 2: Convert to fraction form
   3,869.28/5,803.83 = 947.57/x
3. Step 3: Cross multiply
   3,869.28x = 5,803.83 × 947.57
4. Step 4: Simplify right side
   3,869.28x = 5,499,506.17
5. Step 5: Solve for x
   x = 5,499,506.17/3,869.28
6. Step 6: Final answer
   x = 1,421.33