Finding the Fourth Proportional to 13,020.71, 19,530.25 and 5,619.96

Step by Step Solution

1. Step 1: Write the proportion equation
   13,020.71 : 19,530.25 = 5,619.96 : x
2. Step 2: Convert to fraction form
   13,020.71/19,530.25 = 5,619.96/x
3. Step 3: Cross multiply
   13,020.71x = 19,530.25 × 5,619.96
4. Step 4: Simplify right side
   13,020.71x = 109,759,209.74
5. Step 5: Solve for x
   x = 109,759,209.74/13,020.71
6. Step 6: Final answer
   x = 8,429.59