Finding the Fourth Proportional to 10,938.09, 16,407.38 and 3,918.57

Step by Step Solution

1. Step 1: Write the proportion equation
   10,938.09 : 16,407.38 = 3,918.57 : x
2. Step 2: Convert to fraction form
   10,938.09/16,407.38 = 3,918.57/x
3. Step 3: Cross multiply
   10,938.09x = 16,407.38 × 3,918.57
4. Step 4: Simplify right side
   10,938.09x = 64,293,467.05
5. Step 5: Solve for x
   x = 64,293,467.05/10,938.09
6. Step 6: Final answer
   x = 5,877.94