Finding the Fourth Proportional to 8,113.61, 12,167.94 and 4,215.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,113.61 : 12,167.94 = 4,215.89 : x
2. Step 2: Convert to fraction form
   8,113.61/12,167.94 = 4,215.89/x
3. Step 3: Cross multiply
   8,113.61x = 12,167.94 × 4,215.89
4. Step 4: Simplify right side
   8,113.61x = 51,298,696.57
5. Step 5: Solve for x
   x = 51,298,696.57/8,113.61
6. Step 6: Final answer
   x = 6,322.55