Finding the Fourth Proportional to 23,290.84, 34,940.57 and 21,178.09

Step by Step Solution

1. Step 1: Write the proportion equation
   23,290.84 : 34,940.57 = 21,178.09 : x
2. Step 2: Convert to fraction form
   23,290.84/34,940.57 = 21,178.09/x
3. Step 3: Cross multiply
   23,290.84x = 34,940.57 × 21,178.09
4. Step 4: Simplify right side
   23,290.84x = 739,974,473.90
5. Step 5: Solve for x
   x = 739,974,473.90/23,290.84
6. Step 6: Final answer
   x = 31,771.05