Finding the Fourth Proportional to 12,870.18, 19,287.81 and 5,465.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.18 : 19,287.81 = 5,465.36 : x
2. Step 2: Convert to fraction form
   12,870.18/19,287.81 = 5,465.36/x
3. Step 3: Cross multiply
   12,870.18x = 19,287.81 × 5,465.36
4. Step 4: Simplify right side
   12,870.18x = 105,414,728.82
5. Step 5: Solve for x
   x = 105,414,728.82/12,870.18
6. Step 6: Final answer
   x = 8,190.62