Finding the Fourth Proportional to 30,781.48, 42,485.05 and 19,443.76

Step by Step Solution

1. Step 1: Write the proportion equation
   30,781.48 : 42,485.05 = 19,443.76 : x
2. Step 2: Convert to fraction form
   30,781.48/42,485.05 = 19,443.76/x
3. Step 3: Cross multiply
   30,781.48x = 42,485.05 × 19,443.76
4. Step 4: Simplify right side
   30,781.48x = 826,069,163.49
5. Step 5: Solve for x
   x = 826,069,163.49/30,781.48
6. Step 6: Final answer
   x = 26,836.56