Finding the Fourth Proportional to 13,019.99, 17,967.93 and 7,981.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,019.99 : 17,967.93 = 7,981.31 : x
2. Step 2: Convert to fraction form
   13,019.99/17,967.93 = 7,981.31/x
3. Step 3: Cross multiply
   13,019.99x = 17,967.93 × 7,981.31
4. Step 4: Simplify right side
   13,019.99x = 143,407,619.39
5. Step 5: Solve for x
   x = 143,407,619.39/13,019.99
6. Step 6: Final answer
   x = 11,014.42