Finding the Fourth Proportional to 3,800.79, 5,691.38 and 3,470.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,800.79 : 5,691.38 = 3,470.31 : x
2. Step 2: Convert to fraction form
   3,800.79/5,691.38 = 3,470.31/x
3. Step 3: Cross multiply
   3,800.79x = 5,691.38 × 3,470.31
4. Step 4: Simplify right side
   3,800.79x = 19,750,835.58
5. Step 5: Solve for x
   x = 19,750,835.58/3,800.79
6. Step 6: Final answer
   x = 5,196.51