Finding the Fourth Proportional to 2,345.82, 3,236.58 and 1,388.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,345.82 : 3,236.58 = 1,388.55 : x
2. Step 2: Convert to fraction form
   2,345.82/3,236.58 = 1,388.55/x
3. Step 3: Cross multiply
   2,345.82x = 3,236.58 × 1,388.55
4. Step 4: Simplify right side
   2,345.82x = 4,494,153.16
5. Step 5: Solve for x
   x = 4,494,153.16/2,345.82
6. Step 6: Final answer
   x = 1,915.81