Finding the Fourth Proportional to 21,100.86, 31,655.97 and 7,953.35

Step by Step Solution

1. Step 1: Write the proportion equation
   21,100.86 : 31,655.97 = 7,953.35 : x
2. Step 2: Convert to fraction form
   21,100.86/31,655.97 = 7,953.35/x
3. Step 3: Cross multiply
   21,100.86x = 31,655.97 × 7,953.35
4. Step 4: Simplify right side
   21,100.86x = 251,770,850.72
5. Step 5: Solve for x
   x = 251,770,850.72/21,100.86
6. Step 6: Final answer
   x = 11,931.78