Finding the Fourth Proportional to 30,769.90, 42,442.72 and 19,419.37

Step by Step Solution

1. Step 1: Write the proportion equation
   30,769.90 : 42,442.72 = 19,419.37 : x
2. Step 2: Convert to fraction form
   30,769.90/42,442.72 = 19,419.37/x
3. Step 3: Cross multiply
   30,769.90x = 42,442.72 × 19,419.37
4. Step 4: Simplify right side
   30,769.90x = 824,210,883.49
5. Step 5: Solve for x
   x = 824,210,883.49/30,769.90
6. Step 6: Final answer
   x = 26,786.27