Finding the Fourth Proportional to 13,188.72, 19,768.69 and 4,861.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,188.72 : 19,768.69 = 4,861.72 : x
2. Step 2: Convert to fraction form
   13,188.72/19,768.69 = 4,861.72/x
3. Step 3: Cross multiply
   13,188.72x = 19,768.69 × 4,861.72
4. Step 4: Simplify right side
   13,188.72x = 96,109,866.33
5. Step 5: Solve for x
   x = 96,109,866.33/13,188.72
6. Step 6: Final answer
   x = 7,287.28