Finding the Fourth Proportional to 9,146, 13,637.56 and 9,128.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,146 : 13,637.56 = 9,128.56 : x
2. Step 2: Convert to fraction form
   9,146/13,637.56 = 9,128.56/x
3. Step 3: Cross multiply
   9,146x = 13,637.56 × 9,128.56
4. Step 4: Simplify right side
   9,146x = 124,491,284.71
5. Step 5: Solve for x
   x = 124,491,284.71/9,146
6. Step 6: Final answer
   x = 13,611.56