Finding the Fourth Proportional to 3,870.47, 5,355.32 and 3,374.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,870.47 : 5,355.32 = 3,374.15 : x
2. Step 2: Convert to fraction form
   3,870.47/5,355.32 = 3,374.15/x
3. Step 3: Cross multiply
   3,870.47x = 5,355.32 × 3,374.15
4. Step 4: Simplify right side
   3,870.47x = 18,069,652.98
5. Step 5: Solve for x
   x = 18,069,652.98/3,870.47
6. Step 6: Final answer
   x = 4,668.59