Finding the Fourth Proportional to 13,271.31, 18,315.54 and 7,607.79

Step by Step Solution

1. Step 1: Write the proportion equation
   13,271.31 : 18,315.54 = 7,607.79 : x
2. Step 2: Convert to fraction form
   13,271.31/18,315.54 = 7,607.79/x
3. Step 3: Cross multiply
   13,271.31x = 18,315.54 × 7,607.79
4. Step 4: Simplify right side
   13,271.31x = 139,340,782.06
5. Step 5: Solve for x
   x = 139,340,782.06/13,271.31
6. Step 6: Final answer
   x = 10,499.40