Finding the Fourth Proportional to 28,423.10, 42,610.34 and 10,905.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,423.10 : 42,610.34 = 10,905.50 : x
2. Step 2: Convert to fraction form
   28,423.10/42,610.34 = 10,905.50/x
3. Step 3: Cross multiply
   28,423.10x = 42,610.34 × 10,905.50
4. Step 4: Simplify right side
   28,423.10x = 464,686,795.29
5. Step 5: Solve for x
   x = 464,686,795.29/28,423.10
6. Step 6: Final answer
   x = 16,348.92