Finding the Fourth Proportional to 28,456.70, 42,691.39 and 8,737.25

Step by Step Solution

1. Step 1: Write the proportion equation
   28,456.70 : 42,691.39 = 8,737.25 : x
2. Step 2: Convert to fraction form
   28,456.70/42,691.39 = 8,737.25/x
3. Step 3: Cross multiply
   28,456.70x = 42,691.39 × 8,737.25
4. Step 4: Simplify right side
   28,456.70x = 373,005,111.98
5. Step 5: Solve for x
   x = 373,005,111.98/28,456.70
6. Step 6: Final answer
   x = 13,107.82