Finding the Fourth Proportional to 28,626.32, 42,946.81 and 8,905.05

Step by Step Solution

1. Step 1: Write the proportion equation
   28,626.32 : 42,946.81 = 8,905.05 : x
2. Step 2: Convert to fraction form
   28,626.32/42,946.81 = 8,905.05/x
3. Step 3: Cross multiply
   28,626.32x = 42,946.81 × 8,905.05
4. Step 4: Simplify right side
   28,626.32x = 382,443,490.39
5. Step 5: Solve for x
   x = 382,443,490.39/28,626.32
6. Step 6: Final answer
   x = 13,359.86