Finding the Fourth Proportional to 13,455.12, 18,566.52 and 7,789.98

Step by Step Solution

1. Step 1: Write the proportion equation
   13,455.12 : 18,566.52 = 7,789.98 : x
2. Step 2: Convert to fraction form
   13,455.12/18,566.52 = 7,789.98/x
3. Step 3: Cross multiply
   13,455.12x = 18,566.52 × 7,789.98
4. Step 4: Simplify right side
   13,455.12x = 144,632,819.47
5. Step 5: Solve for x
   x = 144,632,819.47/13,455.12
6. Step 6: Final answer
   x = 10,749.28