Finding the Fourth Proportional to 28,426.54, 42,632.53 and 8,431.35

Step by Step Solution

1. Step 1: Write the proportion equation
   28,426.54 : 42,632.53 = 8,431.35 : x
2. Step 2: Convert to fraction form
   28,426.54/42,632.53 = 8,431.35/x
3. Step 3: Cross multiply
   28,426.54x = 42,632.53 × 8,431.35
4. Step 4: Simplify right side
   28,426.54x = 359,449,781.82
5. Step 5: Solve for x
   x = 359,449,781.82/28,426.54
6. Step 6: Final answer
   x = 12,644.87