Finding the Fourth Proportional to 8,915.18, 12,303.37 and 5,378.31

Step by Step Solution

1. Step 1: Write the proportion equation
   8,915.18 : 12,303.37 = 5,378.31 : x
2. Step 2: Convert to fraction form
   8,915.18/12,303.37 = 5,378.31/x
3. Step 3: Cross multiply
   8,915.18x = 12,303.37 × 5,378.31
4. Step 4: Simplify right side
   8,915.18x = 66,171,355.22
5. Step 5: Solve for x
   x = 66,171,355.22/8,915.18
6. Step 6: Final answer
   x = 7,422.33