Finding the Fourth Proportional to 19,617.78, 27,071.88 and 10,665.12

Step by Step Solution

1. Step 1: Write the proportion equation
   19,617.78 : 27,071.88 = 10,665.12 : x
2. Step 2: Convert to fraction form
   19,617.78/27,071.88 = 10,665.12/x
3. Step 3: Cross multiply
   19,617.78x = 27,071.88 × 10,665.12
4. Step 4: Simplify right side
   19,617.78x = 288,724,848.83
5. Step 5: Solve for x
   x = 288,724,848.83/19,617.78
6. Step 6: Final answer
   x = 14,717.51