Finding the Fourth Proportional to 21,530.81, 32,238.34 and 12,156.82

Step by Step Solution

1. Step 1: Write the proportion equation
   21,530.81 : 32,238.34 = 12,156.82 : x
2. Step 2: Convert to fraction form
   21,530.81/32,238.34 = 12,156.82/x
3. Step 3: Cross multiply
   21,530.81x = 32,238.34 × 12,156.82
4. Step 4: Simplify right side
   21,530.81x = 391,915,585.49
5. Step 5: Solve for x
   x = 391,915,585.49/21,530.81
6. Step 6: Final answer
   x = 18,202.55