Finding the Fourth Proportional to 13,869.32, 19,139.69 and 7,581.70

Step by Step Solution

1. Step 1: Write the proportion equation
   13,869.32 : 19,139.69 = 7,581.70 : x
2. Step 2: Convert to fraction form
   13,869.32/19,139.69 = 7,581.70/x
3. Step 3: Cross multiply
   13,869.32x = 19,139.69 × 7,581.70
4. Step 4: Simplify right side
   13,869.32x = 145,111,387.67
5. Step 5: Solve for x
   x = 145,111,387.67/13,869.32
6. Step 6: Final answer
   x = 10,462.76