Finding the Fourth Proportional to 11,101.95, 15,322.83 and 7,128.09

Step by Step Solution

1. Step 1: Write the proportion equation
   11,101.95 : 15,322.83 = 7,128.09 : x
2. Step 2: Convert to fraction form
   11,101.95/15,322.83 = 7,128.09/x
3. Step 3: Cross multiply
   11,101.95x = 15,322.83 × 7,128.09
4. Step 4: Simplify right side
   11,101.95x = 109,222,511.29
5. Step 5: Solve for x
   x = 109,222,511.29/11,101.95
6. Step 6: Final answer
   x = 9,838.14