Finding the Fourth Proportional to 23,139.10, 31,929.69 and 13,705.84

Step by Step Solution

1. Step 1: Write the proportion equation
   23,139.10 : 31,929.69 = 13,705.84 : x
2. Step 2: Convert to fraction form
   23,139.10/31,929.69 = 13,705.84/x
3. Step 3: Cross multiply
   23,139.10x = 31,929.69 × 13,705.84
4. Step 4: Simplify right side
   23,139.10x = 437,623,222.39
5. Step 5: Solve for x
   x = 437,623,222.39/23,139.10
6. Step 6: Final answer
   x = 18,912.72