Finding the Fourth Proportional to 21,181.59, 31,755.78 and 13,374

Step by Step Solution

1. Step 1: Write the proportion equation
   21,181.59 : 31,755.78 = 13,374 : x
2. Step 2: Convert to fraction form
   21,181.59/31,755.78 = 13,374/x
3. Step 3: Cross multiply
   21,181.59x = 31,755.78 × 13,374
4. Step 4: Simplify right side
   21,181.59x = 424,701,801.72
5. Step 5: Solve for x
   x = 424,701,801.72/21,181.59
6. Step 6: Final answer
   x = 20,050.52