Finding the Fourth Proportional to 30,991.20, 42,754.68 and 19,050.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,991.20 : 42,754.68 = 19,050.72 : x
2. Step 2: Convert to fraction form
   30,991.20/42,754.68 = 19,050.72/x
3. Step 3: Cross multiply
   30,991.20x = 42,754.68 × 19,050.72
4. Step 4: Simplify right side
   30,991.20x = 814,507,437.37
5. Step 5: Solve for x
   x = 814,507,437.37/30,991.20
6. Step 6: Final answer
   x = 26,281.89