Finding the Fourth Proportional to 23,131.69, 31,921.83 and 13,699.64

Step by Step Solution

1. Step 1: Write the proportion equation
   23,131.69 : 31,921.83 = 13,699.64 : x
2. Step 2: Convert to fraction form
   23,131.69/31,921.83 = 13,699.64/x
3. Step 3: Cross multiply
   23,131.69x = 31,921.83 × 13,699.64
4. Step 4: Simplify right side
   23,131.69x = 437,317,579.14
5. Step 5: Solve for x
   x = 437,317,579.14/23,131.69
6. Step 6: Final answer
   x = 18,905.56