Finding the Fourth Proportional to 8,870.93, 12,247.59 and 5,518.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,870.93 : 12,247.59 = 5,518.31 : x
2. Step 2: Convert to fraction form
   8,870.93/12,247.59 = 5,518.31/x
3. Step 3: Cross multiply
   8,870.93x = 12,247.59 × 5,518.31
4. Step 4: Simplify right side
   8,870.93x = 67,585,998.37
5. Step 5: Solve for x
   x = 67,585,998.37/8,870.93
6. Step 6: Final answer
   x = 7,618.82