Finding the Fourth Proportional to 13,289.51, 18,339.31 and 7,624.01

Step by Step Solution

1. Step 1: Write the proportion equation
   13,289.51 : 18,339.31 = 7,624.01 : x
2. Step 2: Convert to fraction form
   13,289.51/18,339.31 = 7,624.01/x
3. Step 3: Cross multiply
   13,289.51x = 18,339.31 × 7,624.01
4. Step 4: Simplify right side
   13,289.51x = 139,819,082.83
5. Step 5: Solve for x
   x = 139,819,082.83/13,289.51
6. Step 6: Final answer
   x = 10,521.01