Finding the Fourth Proportional to 19,871.59, 29,799.56 and 7,218.35

Step by Step Solution

1. Step 1: Write the proportion equation
   19,871.59 : 29,799.56 = 7,218.35 : x
2. Step 2: Convert to fraction form
   19,871.59/29,799.56 = 7,218.35/x
3. Step 3: Cross multiply
   19,871.59x = 29,799.56 × 7,218.35
4. Step 4: Simplify right side
   19,871.59x = 215,103,692.33
5. Step 5: Solve for x
   x = 215,103,692.33/19,871.59
6. Step 6: Final answer
   x = 10,824.69