Finding the Fourth Proportional to 30,780.34, 42,499.62 and 18,859.96

Step by Step Solution

1. Step 1: Write the proportion equation
   30,780.34 : 42,499.62 = 18,859.96 : x
2. Step 2: Convert to fraction form
   30,780.34/42,499.62 = 18,859.96/x
3. Step 3: Cross multiply
   30,780.34x = 42,499.62 × 18,859.96
4. Step 4: Simplify right side
   30,780.34x = 801,541,133.22
5. Step 5: Solve for x
   x = 801,541,133.22/30,780.34
6. Step 6: Final answer
   x = 26,040.68