Finding the Fourth Proportional to 12,005.12, 16,557.54 and 7,289.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,005.12 : 16,557.54 = 7,289.30 : x
2. Step 2: Convert to fraction form
   12,005.12/16,557.54 = 7,289.30/x
3. Step 3: Cross multiply
   12,005.12x = 16,557.54 × 7,289.30
4. Step 4: Simplify right side
   12,005.12x = 120,692,876.32
5. Step 5: Solve for x
   x = 120,692,876.32/12,005.12
6. Step 6: Final answer
   x = 10,053.45