Finding the Fourth Proportional to 5,112.72, 7,663.60 and 2,916.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,112.72 : 7,663.60 = 2,916.72 : x
2. Step 2: Convert to fraction form
   5,112.72/7,663.60 = 2,916.72/x
3. Step 3: Cross multiply
   5,112.72x = 7,663.60 × 2,916.72
4. Step 4: Simplify right side
   5,112.72x = 22,352,575.39
5. Step 5: Solve for x
   x = 22,352,575.39/5,112.72
6. Step 6: Final answer
   x = 4,371.95