Finding the Fourth Proportional to 9,491.31, 13,102.56 and 5,511.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,491.31 : 13,102.56 = 5,511.78 : x
2. Step 2: Convert to fraction form
   9,491.31/13,102.56 = 5,511.78/x
3. Step 3: Cross multiply
   9,491.31x = 13,102.56 × 5,511.78
4. Step 4: Simplify right side
   9,491.31x = 72,218,428.16
5. Step 5: Solve for x
   x = 72,218,428.16/9,491.31
6. Step 6: Final answer
   x = 7,608.90