Finding the Fourth Proportional to 20,770.38, 31,160.76 and 5,978.96

Step by Step Solution

1. Step 1: Write the proportion equation
   20,770.38 : 31,160.76 = 5,978.96 : x
2. Step 2: Convert to fraction form
   20,770.38/31,160.76 = 5,978.96/x
3. Step 3: Cross multiply
   20,770.38x = 31,160.76 × 5,978.96
4. Step 4: Simplify right side
   20,770.38x = 186,308,937.61
5. Step 5: Solve for x
   x = 186,308,937.61/20,770.38
6. Step 6: Final answer
   x = 8,969.93