Finding the Fourth Proportional to 13,630.18, 18,809.82 and 7,661.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,630.18 : 18,809.82 = 7,661.50 : x
2. Step 2: Convert to fraction form
   13,630.18/18,809.82 = 7,661.50/x
3. Step 3: Cross multiply
   13,630.18x = 18,809.82 × 7,661.50
4. Step 4: Simplify right side
   13,630.18x = 144,111,341.88
5. Step 5: Solve for x
   x = 144,111,341.88/13,630.18
6. Step 6: Final answer
   x = 10,572.96