Finding the Fourth Proportional to 20,673.36, 31,009.82 and 5,090.99

Step by Step Solution

1. Step 1: Write the proportion equation
   20,673.36 : 31,009.82 = 5,090.99 : x
2. Step 2: Convert to fraction form
   20,673.36/31,009.82 = 5,090.99/x
3. Step 3: Cross multiply
   20,673.36x = 31,009.82 × 5,090.99
4. Step 4: Simplify right side
   20,673.36x = 157,870,503.02
5. Step 5: Solve for x
   x = 157,870,503.02/20,673.36
6. Step 6: Final answer
   x = 7,636.42