Finding the Fourth Proportional to 30,499.48, 42,055.86 and 19,869.40

Step by Step Solution

1. Step 1: Write the proportion equation
   30,499.48 : 42,055.86 = 19,869.40 : x
2. Step 2: Convert to fraction form
   30,499.48/42,055.86 = 19,869.40/x
3. Step 3: Cross multiply
   30,499.48x = 42,055.86 × 19,869.40
4. Step 4: Simplify right side
   30,499.48x = 835,624,704.68
5. Step 5: Solve for x
   x = 835,624,704.68/30,499.48
6. Step 6: Final answer
   x = 27,398.00