Finding the Fourth Proportional to 21,423.61, 32,138.41 and 8,940.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,423.61 : 32,138.41 = 8,940.78 : x
2. Step 2: Convert to fraction form
   21,423.61/32,138.41 = 8,940.78/x
3. Step 3: Cross multiply
   21,423.61x = 32,138.41 × 8,940.78
4. Step 4: Simplify right side
   21,423.61x = 287,342,486.89
5. Step 5: Solve for x
   x = 287,342,486.89/21,423.61
6. Step 6: Final answer
   x = 13,412.42