Finding the Fourth Proportional to 15,528.02, 21,428.69 and 8,454.47

Step by Step Solution

1. Step 1: Write the proportion equation
   15,528.02 : 21,428.69 = 8,454.47 : x
2. Step 2: Convert to fraction form
   15,528.02/21,428.69 = 8,454.47/x
3. Step 3: Cross multiply
   15,528.02x = 21,428.69 × 8,454.47
4. Step 4: Simplify right side
   15,528.02x = 181,168,067.33
5. Step 5: Solve for x
   x = 181,168,067.33/15,528.02
6. Step 6: Final answer
   x = 11,667.17