Finding the Fourth Proportional to 13,147.31, 19,689.54 and 7,583.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,147.31 : 19,689.54 = 7,583.79 : x
2. Step 2: Convert to fraction form
   13,147.31/19,689.54 = 7,583.79/x
3. Step 3: Cross multiply
   13,147.31x = 19,689.54 × 7,583.79
4. Step 4: Simplify right side
   13,147.31x = 149,321,336.56
5. Step 5: Solve for x
   x = 149,321,336.56/13,147.31
6. Step 6: Final answer
   x = 11,357.56