Finding the Fourth Proportional to 70,439.16, 105,661.98 and 28,857

Step by Step Solution

1. Step 1: Write the proportion equation
   70,439.16 : 105,661.98 = 28,857 : x
2. Step 2: Convert to fraction form
   70,439.16/105,661.98 = 28,857/x
3. Step 3: Cross multiply
   70,439.16x = 105,661.98 × 28,857
4. Step 4: Simplify right side
   70,439.16x = 3,049,087,756.86
5. Step 5: Solve for x
   x = 3,049,087,756.86/70,439.16
6. Step 6: Final answer
   x = 43,286.83