Finding the Fourth Proportional to 13,123.89, 19,678.56 and 5,225.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,123.89 : 19,678.56 = 5,225.79 : x
2. Step 2: Convert to fraction form
   13,123.89/19,678.56 = 5,225.79/x
3. Step 3: Cross multiply
   13,123.89x = 19,678.56 × 5,225.79
4. Step 4: Simplify right side
   13,123.89x = 102,836,022.06
5. Step 5: Solve for x
   x = 102,836,022.06/13,123.89
6. Step 6: Final answer
   x = 7,835.79