Finding the Fourth Proportional to 20,973.59, 31,460.79 and 5,390.81

Step by Step Solution

1. Step 1: Write the proportion equation
   20,973.59 : 31,460.79 = 5,390.81 : x
2. Step 2: Convert to fraction form
   20,973.59/31,460.79 = 5,390.81/x
3. Step 3: Cross multiply
   20,973.59x = 31,460.79 × 5,390.81
4. Step 4: Simplify right side
   20,973.59x = 169,599,141.34
5. Step 5: Solve for x
   x = 169,599,141.34/20,973.59
6. Step 6: Final answer
   x = 8,086.32