Finding the Fourth Proportional to 13,868.86, 19,139.61 and 7,581.64

Step by Step Solution

1. Step 1: Write the proportion equation
   13,868.86 : 19,139.61 = 7,581.64 : x
2. Step 2: Convert to fraction form
   13,868.86/19,139.61 = 7,581.64/x
3. Step 3: Cross multiply
   13,868.86x = 19,139.61 × 7,581.64
4. Step 4: Simplify right side
   13,868.86x = 145,109,632.76
5. Step 5: Solve for x
   x = 145,109,632.76/13,868.86
6. Step 6: Final answer
   x = 10,462.98