Finding the Fourth Proportional to 8,809.47, 12,156.89 and 5,451.39

Step by Step Solution

1. Step 1: Write the proportion equation
   8,809.47 : 12,156.89 = 5,451.39 : x
2. Step 2: Convert to fraction form
   8,809.47/12,156.89 = 5,451.39/x
3. Step 3: Cross multiply
   8,809.47x = 12,156.89 × 5,451.39
4. Step 4: Simplify right side
   8,809.47x = 66,271,921.32
5. Step 5: Solve for x
   x = 66,271,921.32/8,809.47
6. Step 6: Final answer
   x = 7,522.80