Finding the Fourth Proportional to 13,019.79, 17,966.23 and 7,641.65

Step by Step Solution

1. Step 1: Write the proportion equation
   13,019.79 : 17,966.23 = 7,641.65 : x
2. Step 2: Convert to fraction form
   13,019.79/17,966.23 = 7,641.65/x
3. Step 3: Cross multiply
   13,019.79x = 17,966.23 × 7,641.65
4. Step 4: Simplify right side
   13,019.79x = 137,291,532.54
5. Step 5: Solve for x
   x = 137,291,532.54/13,019.79
6. Step 6: Final answer
   x = 10,544.84