Finding the Fourth Proportional to 30,990.56, 42,768.94 and 17,379.86

Step by Step Solution

1. Step 1: Write the proportion equation
   30,990.56 : 42,768.94 = 17,379.86 : x
2. Step 2: Convert to fraction form
   30,990.56/42,768.94 = 17,379.86/x
3. Step 3: Cross multiply
   30,990.56x = 42,768.94 × 17,379.86
4. Step 4: Simplify right side
   30,990.56x = 743,318,189.55
5. Step 5: Solve for x
   x = 743,318,189.55/30,990.56
6. Step 6: Final answer
   x = 23,985.31