Finding the Fourth Proportional to 13,447.01, 18,556.61 and 7,478.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,447.01 : 18,556.61 = 7,478.55 : x
2. Step 2: Convert to fraction form
   13,447.01/18,556.61 = 7,478.55/x
3. Step 3: Cross multiply
   13,447.01x = 18,556.61 × 7,478.55
4. Step 4: Simplify right side
   13,447.01x = 138,776,535.72
5. Step 5: Solve for x
   x = 138,776,535.72/13,447.01
6. Step 6: Final answer
   x = 10,320.25