Finding the Fourth Proportional to 28,100.92, 42,151.32 and 8,378.98

Step by Step Solution

1. Step 1: Write the proportion equation
   28,100.92 : 42,151.32 = 8,378.98 : x
2. Step 2: Convert to fraction form
   28,100.92/42,151.32 = 8,378.98/x
3. Step 3: Cross multiply
   28,100.92x = 42,151.32 × 8,378.98
4. Step 4: Simplify right side
   28,100.92x = 353,185,067.25
5. Step 5: Solve for x
   x = 353,185,067.25/28,100.92
6. Step 6: Final answer
   x = 12,568.45