Finding the Fourth Proportional to 51,106.48, 76,663.56 and 13,665.72

Step by Step Solution

1. Step 1: Write the proportion equation
   51,106.48 : 76,663.56 = 13,665.72 : x
2. Step 2: Convert to fraction form
   51,106.48/76,663.56 = 13,665.72/x
3. Step 3: Cross multiply
   51,106.48x = 76,663.56 × 13,665.72
4. Step 4: Simplify right side
   51,106.48x = 1,047,662,745.16
5. Step 5: Solve for x
   x = 1,047,662,745.16/51,106.48
6. Step 6: Final answer
   x = 20,499.61