Finding the Fourth Proportional to 21,002.01, 31,503.62 and 7,851.86

Step by Step Solution

1. Step 1: Write the proportion equation
   21,002.01 : 31,503.62 = 7,851.86 : x
2. Step 2: Convert to fraction form
   21,002.01/31,503.62 = 7,851.86/x
3. Step 3: Cross multiply
   21,002.01x = 31,503.62 × 7,851.86
4. Step 4: Simplify right side
   21,002.01x = 247,362,013.73
5. Step 5: Solve for x
   x = 247,362,013.73/21,002.01
6. Step 6: Final answer
   x = 11,778.02