Finding the Fourth Proportional to 13,098.70, 19,636.56 and 5,206.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,098.70 : 19,636.56 = 5,206.72 : x
2. Step 2: Convert to fraction form
   13,098.70/19,636.56 = 5,206.72/x
3. Step 3: Cross multiply
   13,098.70x = 19,636.56 × 5,206.72
4. Step 4: Simplify right side
   13,098.70x = 102,242,069.68
5. Step 5: Solve for x
   x = 102,242,069.68/13,098.70
6. Step 6: Final answer
   x = 7,805.51