Finding the Fourth Proportional to 13,554.56, 18,705.39 and 7,586.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,554.56 : 18,705.39 = 7,586.78 : x
2. Step 2: Convert to fraction form
   13,554.56/18,705.39 = 7,586.78/x
3. Step 3: Cross multiply
   13,554.56x = 18,705.39 × 7,586.78
4. Step 4: Simplify right side
   13,554.56x = 141,913,725.51
5. Step 5: Solve for x
   x = 141,913,725.51/13,554.56
6. Step 6: Final answer
   x = 10,469.81