Finding the Fourth Proportional to 13,137.47, 19,674.89 and 7,279.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,137.47 : 19,674.89 = 7,279.55 : x
2. Step 2: Convert to fraction form
   13,137.47/19,674.89 = 7,279.55/x
3. Step 3: Cross multiply
   13,137.47x = 19,674.89 × 7,279.55
4. Step 4: Simplify right side
   13,137.47x = 143,224,309.10
5. Step 5: Solve for x
   x = 143,224,309.10/13,137.47
6. Step 6: Final answer
   x = 10,901.97