Finding the Fourth Proportional to 31,784.28, 43,876.74 and 21,729

Step by Step Solution

1. Step 1: Write the proportion equation
   31,784.28 : 43,876.74 = 21,729 : x
2. Step 2: Convert to fraction form
   31,784.28/43,876.74 = 21,729/x
3. Step 3: Cross multiply
   31,784.28x = 43,876.74 × 21,729
4. Step 4: Simplify right side
   31,784.28x = 953,397,683.46
5. Step 5: Solve for x
   x = 953,397,683.46/31,784.28
6. Step 6: Final answer
   x = 29,995.89