Finding the Fourth Proportional to 1,387.52, 1,904.75 and 1,190.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.52 : 1,904.75 = 1,190.69 : x
2. Step 2: Convert to fraction form
   1,387.52/1,904.75 = 1,190.69/x
3. Step 3: Cross multiply
   1,387.52x = 1,904.75 × 1,190.69
4. Step 4: Simplify right side
   1,387.52x = 2,267,951.30
5. Step 5: Solve for x
   x = 2,267,951.30/1,387.52
6. Step 6: Final answer
   x = 1,634.54