Finding the Fourth Proportional to 13,111.29, 19,630.31 and 7,085.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,111.29 : 19,630.31 = 7,085.79 : x
2. Step 2: Convert to fraction form
   13,111.29/19,630.31 = 7,085.79/x
3. Step 3: Cross multiply
   13,111.29x = 19,630.31 × 7,085.79
4. Step 4: Simplify right side
   13,111.29x = 139,096,218.87
5. Step 5: Solve for x
   x = 139,096,218.87/13,111.29
6. Step 6: Final answer
   x = 10,608.89