Finding the Fourth Proportional to 31,715.20, 43,678.20 and 31,026.43

Step by Step Solution

1. Step 1: Write the proportion equation
   31,715.20 : 43,678.20 = 31,026.43 : x
2. Step 2: Convert to fraction form
   31,715.20/43,678.20 = 31,026.43/x
3. Step 3: Cross multiply
   31,715.20x = 43,678.20 × 31,026.43
4. Step 4: Simplify right side
   31,715.20x = 1,355,178,614.83
5. Step 5: Solve for x
   x = 1,355,178,614.83/31,715.20
6. Step 6: Final answer
   x = 42,729.63