Finding the Fourth Proportional to 28,100.73, 42,171.89 and 13,309.69

Step by Step Solution

1. Step 1: Write the proportion equation
   28,100.73 : 42,171.89 = 13,309.69 : x
2. Step 2: Convert to fraction form
   28,100.73/42,171.89 = 13,309.69/x
3. Step 3: Cross multiply
   28,100.73x = 42,171.89 × 13,309.69
4. Step 4: Simplify right side
   28,100.73x = 561,294,571.75
5. Step 5: Solve for x
   x = 561,294,571.75/28,100.73
6. Step 6: Final answer
   x = 19,974.38