Finding the Fourth Proportional to 21,123.16, 31,681.86 and 5,539.48

Step by Step Solution

1. Step 1: Write the proportion equation
   21,123.16 : 31,681.86 = 5,539.48 : x
2. Step 2: Convert to fraction form
   21,123.16/31,681.86 = 5,539.48/x
3. Step 3: Cross multiply
   21,123.16x = 31,681.86 × 5,539.48
4. Step 4: Simplify right side
   21,123.16x = 175,501,029.83
5. Step 5: Solve for x
   x = 175,501,029.83/21,123.16
6. Step 6: Final answer
   x = 8,308.46