Finding the Fourth Proportional to 70,448.62, 105,715.86 and 28,320.80

Step by Step Solution

1. Step 1: Write the proportion equation
   70,448.62 : 105,715.86 = 28,320.80 : x
2. Step 2: Convert to fraction form
   70,448.62/105,715.86 = 28,320.80/x
3. Step 3: Cross multiply
   70,448.62x = 105,715.86 × 28,320.80
4. Step 4: Simplify right side
   70,448.62x = 2,993,957,727.89
5. Step 5: Solve for x
   x = 2,993,957,727.89/70,448.62
6. Step 6: Final answer
   x = 42,498.46