Finding the Fourth Proportional to 8,905.34, 12,276.15 and 7,640.30

Step by Step Solution

1. Step 1: Write the proportion equation
   8,905.34 : 12,276.15 = 7,640.30 : x
2. Step 2: Convert to fraction form
   8,905.34/12,276.15 = 7,640.30/x
3. Step 3: Cross multiply
   8,905.34x = 12,276.15 × 7,640.30
4. Step 4: Simplify right side
   8,905.34x = 93,793,468.85
5. Step 5: Solve for x
   x = 93,793,468.85/8,905.34
6. Step 6: Final answer
   x = 10,532.27