Finding the Fourth Proportional to 13,445.39, 18,554.05 and 7,477.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,445.39 : 18,554.05 = 7,477.61 : x
2. Step 2: Convert to fraction form
   13,445.39/18,554.05 = 7,477.61/x
3. Step 3: Cross multiply
   13,445.39x = 18,554.05 × 7,477.61
4. Step 4: Simplify right side
   13,445.39x = 138,739,912.43
5. Step 5: Solve for x
   x = 138,739,912.43/13,445.39
6. Step 6: Final answer
   x = 10,318.78