Finding the Fourth Proportional to 21,280.91, 29,363.18 and 12,327.87

Step by Step Solution

1. Step 1: Write the proportion equation
   21,280.91 : 29,363.18 = 12,327.87 : x
2. Step 2: Convert to fraction form
   21,280.91/29,363.18 = 12,327.87/x
3. Step 3: Cross multiply
   21,280.91x = 29,363.18 × 12,327.87
4. Step 4: Simplify right side
   21,280.91x = 361,985,465.83
5. Step 5: Solve for x
   x = 361,985,465.83/21,280.91
6. Step 6: Final answer
   x = 17,009.87