Finding the Fourth Proportional to 13,109.05, 19,649.73 and 8,938.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,109.05 : 19,649.73 = 8,938.72 : x
2. Step 2: Convert to fraction form
   13,109.05/19,649.73 = 8,938.72/x
3. Step 3: Cross multiply
   13,109.05x = 19,649.73 × 8,938.72
4. Step 4: Simplify right side
   13,109.05x = 175,643,434.55
5. Step 5: Solve for x
   x = 175,643,434.55/13,109.05
6. Step 6: Final answer
   x = 13,398.64