Finding the Fourth Proportional to 19,556.71, 27,010.50 and 13,258.15

Step by Step Solution

1. Step 1: Write the proportion equation
   19,556.71 : 27,010.50 = 13,258.15 : x
2. Step 2: Convert to fraction form
   19,556.71/27,010.50 = 13,258.15/x
3. Step 3: Cross multiply
   19,556.71x = 27,010.50 × 13,258.15
4. Step 4: Simplify right side
   19,556.71x = 358,109,260.58
5. Step 5: Solve for x
   x = 358,109,260.58/19,556.71
6. Step 6: Final answer
   x = 18,311.32