Finding the Fourth Proportional to 23,091.61, 31,865.78 and 13,019.97

Step by Step Solution

1. Step 1: Write the proportion equation
   23,091.61 : 31,865.78 = 13,019.97 : x
2. Step 2: Convert to fraction form
   23,091.61/31,865.78 = 13,019.97/x
3. Step 3: Cross multiply
   23,091.61x = 31,865.78 × 13,019.97
4. Step 4: Simplify right side
   23,091.61x = 414,891,499.63
5. Step 5: Solve for x
   x = 414,891,499.63/23,091.61
6. Step 6: Final answer
   x = 17,967.20