Finding the Fourth Proportional to 19,856.65, 27,383.89 and 13,492.78

Step by Step Solution

1. Step 1: Write the proportion equation
   19,856.65 : 27,383.89 = 13,492.78 : x
2. Step 2: Convert to fraction form
   19,856.65/27,383.89 = 13,492.78/x
3. Step 3: Cross multiply
   19,856.65x = 27,383.89 × 13,492.78
4. Step 4: Simplify right side
   19,856.65x = 369,484,598.93
5. Step 5: Solve for x
   x = 369,484,598.93/19,856.65
6. Step 6: Final answer
   x = 18,607.60