Finding the Fourth Proportional to 3,603.68, 5,406.10 and 1,938.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,603.68 : 5,406.10 = 1,938.31 : x
2. Step 2: Convert to fraction form
   3,603.68/5,406.10 = 1,938.31/x
3. Step 3: Cross multiply
   3,603.68x = 5,406.10 × 1,938.31
4. Step 4: Simplify right side
   3,603.68x = 10,478,715.27
5. Step 5: Solve for x
   x = 10,478,715.27/3,603.68
6. Step 6: Final answer
   x = 2,907.78