Finding the Fourth Proportional to 12,749.72, 19,131.13 and 5,258.81

Step by Step Solution

1. Step 1: Write the proportion equation
   12,749.72 : 19,131.13 = 5,258.81 : x
2. Step 2: Convert to fraction form
   12,749.72/19,131.13 = 5,258.81/x
3. Step 3: Cross multiply
   12,749.72x = 19,131.13 × 5,258.81
4. Step 4: Simplify right side
   12,749.72x = 100,606,868.95
5. Step 5: Solve for x
   x = 100,606,868.95/12,749.72
6. Step 6: Final answer
   x = 7,890.91