Finding the Fourth Proportional to 13,101, 19,678.60 and 10,605.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,101 : 19,678.60 = 10,605.12 : x
2. Step 2: Convert to fraction form
   13,101/19,678.60 = 10,605.12/x
3. Step 3: Cross multiply
   13,101x = 19,678.60 × 10,605.12
4. Step 4: Simplify right side
   13,101x = 208,693,914.43
5. Step 5: Solve for x
   x = 208,693,914.43/13,101
6. Step 6: Final answer
   x = 15,929.62