Finding the Fourth Proportional to 19,665.86, 27,139.02 and 10,713.60

Step by Step Solution

1. Step 1: Write the proportion equation
   19,665.86 : 27,139.02 = 10,713.60 : x
2. Step 2: Convert to fraction form
   19,665.86/27,139.02 = 10,713.60/x
3. Step 3: Cross multiply
   19,665.86x = 27,139.02 × 10,713.60
4. Step 4: Simplify right side
   19,665.86x = 290,756,564.50
5. Step 5: Solve for x
   x = 290,756,564.50/19,665.86
6. Step 6: Final answer
   x = 14,784.84