Finding the Fourth Proportional to 71,456.81, 107,196.14 and 18,870.39

Step by Step Solution

1. Step 1: Write the proportion equation
   71,456.81 : 107,196.14 = 18,870.39 : x
2. Step 2: Convert to fraction form
   71,456.81/107,196.14 = 18,870.39/x
3. Step 3: Cross multiply
   71,456.81x = 107,196.14 × 18,870.39
4. Step 4: Simplify right side
   71,456.81x = 2,022,833,015.47
5. Step 5: Solve for x
   x = 2,022,833,015.47/71,456.81
6. Step 6: Final answer
   x = 28,308.47