Finding the Fourth Proportional to 31,856.50, 43,907.78 and 21,767.43

Step by Step Solution

1. Step 1: Write the proportion equation
   31,856.50 : 43,907.78 = 21,767.43 : x
2. Step 2: Convert to fraction form
   31,856.50/43,907.78 = 21,767.43/x
3. Step 3: Cross multiply
   31,856.50x = 43,907.78 × 21,767.43
4. Step 4: Simplify right side
   31,856.50x = 955,759,499.43
5. Step 5: Solve for x
   x = 955,759,499.43/31,856.50
6. Step 6: Final answer
   x = 30,002.02