Finding the Fourth Proportional to 19,858.42, 27,386.31 and 13,494.51

Step by Step Solution

1. Step 1: Write the proportion equation
   19,858.42 : 27,386.31 = 13,494.51 : x
2. Step 2: Convert to fraction form
   19,858.42/27,386.31 = 13,494.51/x
3. Step 3: Cross multiply
   19,858.42x = 27,386.31 × 13,494.51
4. Step 4: Simplify right side
   19,858.42x = 369,564,856.86
5. Step 5: Solve for x
   x = 369,564,856.86/19,858.42
6. Step 6: Final answer
   x = 18,609.98