Finding the Fourth Proportional to 2,381.76, 3,285.72 and 1,387.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,381.76 : 3,285.72 = 1,387.08 : x
2. Step 2: Convert to fraction form
   2,381.76/3,285.72 = 1,387.08/x
3. Step 3: Cross multiply
   2,381.76x = 3,285.72 × 1,387.08
4. Step 4: Simplify right side
   2,381.76x = 4,557,556.50
5. Step 5: Solve for x
   x = 4,557,556.50/2,381.76
6. Step 6: Final answer
   x = 1,913.52