Finding the Fourth Proportional to 3,902.52, 5,374.50 and 3,890.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,902.52 : 5,374.50 = 3,890.34 : x
2. Step 2: Convert to fraction form
   3,902.52/5,374.50 = 3,890.34/x
3. Step 3: Cross multiply
   3,902.52x = 5,374.50 × 3,890.34
4. Step 4: Simplify right side
   3,902.52x = 20,908,632.33
5. Step 5: Solve for x
   x = 20,908,632.33/3,902.52
6. Step 6: Final answer
   x = 5,357.73