Finding the Fourth Proportional to 70,711.37, 106,096.43 and 28,621.21

Step by Step Solution

1. Step 1: Write the proportion equation
   70,711.37 : 106,096.43 = 28,621.21 : x
2. Step 2: Convert to fraction form
   70,711.37/106,096.43 = 28,621.21/x
3. Step 3: Cross multiply
   70,711.37x = 106,096.43 × 28,621.21
4. Step 4: Simplify right side
   70,711.37x = 3,036,608,009.59
5. Step 5: Solve for x
   x = 3,036,608,009.59/70,711.37
6. Step 6: Final answer
   x = 42,943.70