Finding the Fourth Proportional to 6,870.15, 9,480.06 and 3,886.20

Step by Step Solution

1. Step 1: Write the proportion equation
   6,870.15 : 9,480.06 = 3,886.20 : x
2. Step 2: Convert to fraction form
   6,870.15/9,480.06 = 3,886.20/x
3. Step 3: Cross multiply
   6,870.15x = 9,480.06 × 3,886.20
4. Step 4: Simplify right side
   6,870.15x = 36,841,409.17
5. Step 5: Solve for x
   x = 36,841,409.17/6,870.15
6. Step 6: Final answer
   x = 5,362.53