Finding the Fourth Proportional to 19,875.59, 27,399.42 and 13,888.67

Step by Step Solution

1. Step 1: Write the proportion equation
   19,875.59 : 27,399.42 = 13,888.67 : x
2. Step 2: Convert to fraction form
   19,875.59/27,399.42 = 13,888.67/x
3. Step 3: Cross multiply
   19,875.59x = 27,399.42 × 13,888.67
4. Step 4: Simplify right side
   19,875.59x = 380,541,502.57
5. Step 5: Solve for x
   x = 380,541,502.57/19,875.59
6. Step 6: Final answer
   x = 19,146.17