Finding the Fourth Proportional to 50,978.70, 70,348.16 and 28,319.15

Step by Step Solution

1. Step 1: Write the proportion equation
   50,978.70 : 70,348.16 = 28,319.15 : x
2. Step 2: Convert to fraction form
   50,978.70/70,348.16 = 28,319.15/x
3. Step 3: Cross multiply
   50,978.70x = 70,348.16 × 28,319.15
4. Step 4: Simplify right side
   50,978.70x = 1,992,200,341.93
5. Step 5: Solve for x
   x = 1,992,200,341.93/50,978.70
6. Step 6: Final answer
   x = 39,079.07