Finding the Fourth Proportional to 30,781.34, 42,501 and 18,860.96

Step by Step Solution

1. Step 1: Write the proportion equation
   30,781.34 : 42,501 = 18,860.96 : x
2. Step 2: Convert to fraction form
   30,781.34/42,501 = 18,860.96/x
3. Step 3: Cross multiply
   30,781.34x = 42,501 × 18,860.96
4. Step 4: Simplify right side
   30,781.34x = 801,609,660.96
5. Step 5: Solve for x
   x = 801,609,660.96/30,781.34
6. Step 6: Final answer
   x = 26,042.07