Finding the Fourth Proportional to 21,123.73, 31,685.52 and 5,328.81

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123.73 : 31,685.52 = 5,328.81 : x
2. Step 2: Convert to fraction form
   21,123.73/31,685.52 = 5,328.81/x
3. Step 3: Cross multiply
   21,123.73x = 31,685.52 × 5,328.81
4. Step 4: Simplify right side
   21,123.73x = 168,845,957.40
5. Step 5: Solve for x
   x = 168,845,957.40/21,123.73
6. Step 6: Final answer
   x = 7,993.19