Finding the Fourth Proportional to 28,100.82, 42,171.98 and 13,309.73

Step by Step Solution

1. Step 1: Write the proportion equation
   28,100.82 : 42,171.98 = 13,309.73 : x
2. Step 2: Convert to fraction form
   28,100.82/42,171.98 = 13,309.73/x
3. Step 3: Cross multiply
   28,100.82x = 42,171.98 × 13,309.73
4. Step 4: Simplify right side
   28,100.82x = 561,297,667.37
5. Step 5: Solve for x
   x = 561,297,667.37/28,100.82
6. Step 6: Final answer
   x = 19,974.42