Finding the Fourth Proportional to 13,821.21, 19,073.33 and 7,854.87

Step by Step Solution

1. Step 1: Write the proportion equation
   13,821.21 : 19,073.33 = 7,854.87 : x
2. Step 2: Convert to fraction form
   13,821.21/19,073.33 = 7,854.87/x
3. Step 3: Cross multiply
   13,821.21x = 19,073.33 × 7,854.87
4. Step 4: Simplify right side
   13,821.21x = 149,818,488.34
5. Step 5: Solve for x
   x = 149,818,488.34/13,821.21
6. Step 6: Final answer
   x = 10,839.75