Finding the Fourth Proportional to 30,128.78, 41,572.50 and 17,379.12

Step by Step Solution

1. Step 1: Write the proportion equation
   30,128.78 : 41,572.50 = 17,379.12 : x
2. Step 2: Convert to fraction form
   30,128.78/41,572.50 = 17,379.12/x
3. Step 3: Cross multiply
   30,128.78x = 41,572.50 × 17,379.12
4. Step 4: Simplify right side
   30,128.78x = 722,493,466.20
5. Step 5: Solve for x
   x = 722,493,466.20/30,128.78
6. Step 6: Final answer
   x = 23,980.18