Finding the Fourth Proportional to 21,931.11, 30,263.77 and 12,370.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,931.11 : 30,263.77 = 12,370.72 : x
2. Step 2: Convert to fraction form
   21,931.11/30,263.77 = 12,370.72/x
3. Step 3: Cross multiply
   21,931.11x = 30,263.77 × 12,370.72
4. Step 4: Simplify right side
   21,931.11x = 374,384,562.96
5. Step 5: Solve for x
   x = 374,384,562.96/21,931.11
6. Step 6: Final answer
   x = 17,070.94