Finding the Fourth Proportional to 13,640.75, 18,822.89 and 7,672.29

Step by Step Solution

1. Step 1: Write the proportion equation
   13,640.75 : 18,822.89 = 7,672.29 : x
2. Step 2: Convert to fraction form
   13,640.75/18,822.89 = 7,672.29/x
3. Step 3: Cross multiply
   13,640.75x = 18,822.89 × 7,672.29
4. Step 4: Simplify right side
   13,640.75x = 144,414,670.72
5. Step 5: Solve for x
   x = 144,414,670.72/13,640.75
6. Step 6: Final answer
   x = 10,587.00