Finding the Fourth Proportional to 21,020.13, 31,526.42 and 5,436.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,020.13 : 31,526.42 = 5,436.81 : x
2. Step 2: Convert to fraction form
   21,020.13/31,526.42 = 5,436.81/x
3. Step 3: Cross multiply
   21,020.13x = 31,526.42 × 5,436.81
4. Step 4: Simplify right side
   21,020.13x = 171,403,128.34
5. Step 5: Solve for x
   x = 171,403,128.34/21,020.13
6. Step 6: Final answer
   x = 8,154.24