Finding the Fourth Proportional to 2,386.40, 3,581.62 and 925.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,386.40 : 3,581.62 = 925.96 : x
2. Step 2: Convert to fraction form
   2,386.40/3,581.62 = 925.96/x
3. Step 3: Cross multiply
   2,386.40x = 3,581.62 × 925.96
4. Step 4: Simplify right side
   2,386.40x = 3,316,436.86
5. Step 5: Solve for x
   x = 3,316,436.86/2,386.40
6. Step 6: Final answer
   x = 1,389.72