Finding the Fourth Proportional to 10,957.86, 16,428.96 and 5,111.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,957.86 : 16,428.96 = 5,111.28 : x
2. Step 2: Convert to fraction form
   10,957.86/16,428.96 = 5,111.28/x
3. Step 3: Cross multiply
   10,957.86x = 16,428.96 × 5,111.28
4. Step 4: Simplify right side
   10,957.86x = 83,973,014.67
5. Step 5: Solve for x
   x = 83,973,014.67/10,957.86
6. Step 6: Final answer
   x = 7,663.27