Finding the Fourth Proportional to 13,225.76, 18,251.54 and 7,636.76

Step by Step Solution

1. Step 1: Write the proportion equation
   13,225.76 : 18,251.54 = 7,636.76 : x
2. Step 2: Convert to fraction form
   13,225.76/18,251.54 = 7,636.76/x
3. Step 3: Cross multiply
   13,225.76x = 18,251.54 × 7,636.76
4. Step 4: Simplify right side
   13,225.76x = 139,382,630.61
5. Step 5: Solve for x
   x = 139,382,630.61/13,225.76
6. Step 6: Final answer
   x = 10,538.72