Finding the Fourth Proportional to 9,111.09, 12,546.83 and 7,915.53

Step by Step Solution

1. Step 1: Write the proportion equation
   9,111.09 : 12,546.83 = 7,915.53 : x
2. Step 2: Convert to fraction form
   9,111.09/12,546.83 = 7,915.53/x
3. Step 3: Cross multiply
   9,111.09x = 12,546.83 × 7,915.53
4. Step 4: Simplify right side
   9,111.09x = 99,314,769.69
5. Step 5: Solve for x
   x = 99,314,769.69/9,111.09
6. Step 6: Final answer
   x = 10,900.43