Finding the Fourth Proportional to 13,111.91, 19,674.69 and 5,212.74

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.91 : 19,674.69 = 5,212.74 : x
2. Step 2: Convert to fraction form
   13,111.91/19,674.69 = 5,212.74/x
3. Step 3: Cross multiply
   13,111.91x = 19,674.69 × 5,212.74
4. Step 4: Simplify right side
   13,111.91x = 102,558,945.18
5. Step 5: Solve for x
   x = 102,558,945.18/13,111.91
6. Step 6: Final answer
   x = 7,821.82