Finding the Fourth Proportional to 22,838.78, 34,209.56 and 12,972.98

Step by Step Solution

1. Step 1: Write the proportion equation
   22,838.78 : 34,209.56 = 12,972.98 : x
2. Step 2: Convert to fraction form
   22,838.78/34,209.56 = 12,972.98/x
3. Step 3: Cross multiply
   22,838.78x = 34,209.56 × 12,972.98
4. Step 4: Simplify right side
   22,838.78x = 443,800,055.65
5. Step 5: Solve for x
   x = 443,800,055.65/22,838.78
6. Step 6: Final answer
   x = 19,431.86