Finding the Fourth Proportional to 30,642.21, 42,279.69 and 17,889.60

Step by Step Solution

1. Step 1: Write the proportion equation
   30,642.21 : 42,279.69 = 17,889.60 : x
2. Step 2: Convert to fraction form
   30,642.21/42,279.69 = 17,889.60/x
3. Step 3: Cross multiply
   30,642.21x = 42,279.69 × 17,889.60
4. Step 4: Simplify right side
   30,642.21x = 756,366,742.22
5. Step 5: Solve for x
   x = 756,366,742.22/30,642.21
6. Step 6: Final answer
   x = 24,683.82