Finding the Fourth Proportional to 16,710.23, 23,059.41 and 9,991.89

Step by Step Solution

1. Step 1: Write the proportion equation
   16,710.23 : 23,059.41 = 9,991.89 : x
2. Step 2: Convert to fraction form
   16,710.23/23,059.41 = 9,991.89/x
3. Step 3: Cross multiply
   16,710.23x = 23,059.41 × 9,991.89
4. Step 4: Simplify right side
   16,710.23x = 230,407,088.18
5. Step 5: Solve for x
   x = 230,407,088.18/16,710.23
6. Step 6: Final answer
   x = 13,788.39