Finding the Fourth Proportional to 10,905.78, 16,348.28 and 3,505.05

Step by Step Solution

1. Step 1: Write the proportion equation
   10,905.78 : 16,348.28 = 3,505.05 : x
2. Step 2: Convert to fraction form
   10,905.78/16,348.28 = 3,505.05/x
3. Step 3: Cross multiply
   10,905.78x = 16,348.28 × 3,505.05
4. Step 4: Simplify right side
   10,905.78x = 57,301,521.29
5. Step 5: Solve for x
   x = 57,301,521.29/10,905.78
6. Step 6: Final answer
   x = 5,254.23