Finding the Fourth Proportional to 30,796.32, 42,499.06 and 19,470.78

Step by Step Solution

1. Step 1: Write the proportion equation
   30,796.32 : 42,499.06 = 19,470.78 : x
2. Step 2: Convert to fraction form
   30,796.32/42,499.06 = 19,470.78/x
3. Step 3: Cross multiply
   30,796.32x = 42,499.06 × 19,470.78
4. Step 4: Simplify right side
   30,796.32x = 827,489,847.47
5. Step 5: Solve for x
   x = 827,489,847.47/30,796.32
6. Step 6: Final answer
   x = 26,869.76