Finding the Fourth Proportional to 30,645.59, 42,262.83 and 19,879.20

Step by Step Solution

1. Step 1: Write the proportion equation
   30,645.59 : 42,262.83 = 19,879.20 : x
2. Step 2: Convert to fraction form
   30,645.59/42,262.83 = 19,879.20/x
3. Step 3: Cross multiply
   30,645.59x = 42,262.83 × 19,879.20
4. Step 4: Simplify right side
   30,645.59x = 840,151,250.14
5. Step 5: Solve for x
   x = 840,151,250.14/30,645.59
6. Step 6: Final answer
   x = 27,415.08