Finding the Fourth Proportional to 42,172.73, 58,170.19 and 30,668.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,172.73 : 58,170.19 = 30,668.30 : x
2. Step 2: Convert to fraction form
   42,172.73/58,170.19 = 30,668.30/x
3. Step 3: Cross multiply
   42,172.73x = 58,170.19 × 30,668.30
4. Step 4: Simplify right side
   42,172.73x = 1,783,980,837.98
5. Step 5: Solve for x
   x = 1,783,980,837.98/42,172.73
6. Step 6: Final answer
   x = 42,301.76