Finding the Fourth Proportional to 28,168.74, 42,253.16 and 8,447.31

Step by Step Solution

1. Step 1: Write the proportion equation
   28,168.74 : 42,253.16 = 8,447.31 : x
2. Step 2: Convert to fraction form
   28,168.74/42,253.16 = 8,447.31/x
3. Step 3: Cross multiply
   28,168.74x = 42,253.16 × 8,447.31
4. Step 4: Simplify right side
   28,168.74x = 356,925,498.76
5. Step 5: Solve for x
   x = 356,925,498.76/28,168.74
6. Step 6: Final answer
   x = 12,670.98