Finding the Fourth Proportional to 13,279.30, 19,920.39 and 4,963.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,279.30 : 19,920.39 = 4,963.30 : x
2. Step 2: Convert to fraction form
   13,279.30/19,920.39 = 4,963.30/x
3. Step 3: Cross multiply
   13,279.30x = 19,920.39 × 4,963.30
4. Step 4: Simplify right side
   13,279.30x = 98,870,871.69
5. Step 5: Solve for x
   x = 98,870,871.69/13,279.30
6. Step 6: Final answer
   x = 7,445.49