Finding the Fourth Proportional to 12,221.48, 18,331.89 and 3,902.01

Step by Step Solution

1. Step 1: Write the proportion equation
   12,221.48 : 18,331.89 = 3,902.01 : x
2. Step 2: Convert to fraction form
   12,221.48/18,331.89 = 3,902.01/x
3. Step 3: Cross multiply
   12,221.48x = 18,331.89 × 3,902.01
4. Step 4: Simplify right side
   12,221.48x = 71,531,134.72
5. Step 5: Solve for x
   x = 71,531,134.72/12,221.48
6. Step 6: Final answer
   x = 5,852.90