Finding the Fourth Proportional to 21,034.53, 31,542.55 and 7,877.67

Step by Step Solution

1. Step 1: Write the proportion equation
   21,034.53 : 31,542.55 = 7,877.67 : x
2. Step 2: Convert to fraction form
   21,034.53/31,542.55 = 7,877.67/x
3. Step 3: Cross multiply
   21,034.53x = 31,542.55 × 7,877.67
4. Step 4: Simplify right side
   21,034.53x = 248,481,799.86
5. Step 5: Solve for x
   x = 248,481,799.86/21,034.53
6. Step 6: Final answer
   x = 11,813.04