Finding the Fourth Proportional to 28,377.86, 42,573.46 and 8,656.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,377.86 : 42,573.46 = 8,656.42 : x
2. Step 2: Convert to fraction form
   28,377.86/42,573.46 = 8,656.42/x
3. Step 3: Cross multiply
   28,377.86x = 42,573.46 × 8,656.42
4. Step 4: Simplify right side
   28,377.86x = 368,533,703.38
5. Step 5: Solve for x
   x = 368,533,703.38/28,377.86
6. Step 6: Final answer
   x = 12,986.66