Finding the Fourth Proportional to 30,642.51, 42,290.61 and 17,213.76

Step by Step Solution

1. Step 1: Write the proportion equation
   30,642.51 : 42,290.61 = 17,213.76 : x
2. Step 2: Convert to fraction form
   30,642.51/42,290.61 = 17,213.76/x
3. Step 3: Cross multiply
   30,642.51x = 42,290.61 × 17,213.76
4. Step 4: Simplify right side
   30,642.51x = 727,980,410.79
5. Step 5: Solve for x
   x = 727,980,410.79/30,642.51
6. Step 6: Final answer
   x = 23,757.21