Finding the Fourth Proportional to 28,490.56, 42,736.32 and 10,961.28

Step by Step Solution

1. Step 1: Write the proportion equation
   28,490.56 : 42,736.32 = 10,961.28 : x
2. Step 2: Convert to fraction form
   28,490.56/42,736.32 = 10,961.28/x
3. Step 3: Cross multiply
   28,490.56x = 42,736.32 × 10,961.28
4. Step 4: Simplify right side
   28,490.56x = 468,444,769.69
5. Step 5: Solve for x
   x = 468,444,769.69/28,490.56
6. Step 6: Final answer
   x = 16,442.10