Finding the Fourth Proportional to 13,386.18, 19,991.38 and 10,757.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,386.18 : 19,991.38 = 10,757.69 : x
2. Step 2: Convert to fraction form
   13,386.18/19,991.38 = 10,757.69/x
3. Step 3: Cross multiply
   13,386.18x = 19,991.38 × 10,757.69
4. Step 4: Simplify right side
   13,386.18x = 215,060,941.86
5. Step 5: Solve for x
   x = 215,060,941.86/13,386.18
6. Step 6: Final answer
   x = 16,065.89