Finding the Fourth Proportional to 1,388.75, 1,904.31 and 1,342.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.75 : 1,904.31 = 1,342.17 : x
2. Step 2: Convert to fraction form
   1,388.75/1,904.31 = 1,342.17/x
3. Step 3: Cross multiply
   1,388.75x = 1,904.31 × 1,342.17
4. Step 4: Simplify right side
   1,388.75x = 2,555,907.75
5. Step 5: Solve for x
   x = 2,555,907.75/1,388.75
6. Step 6: Final answer
   x = 1,840.44