Finding the Fourth Proportional to 1,383.72, 1,909.94 and 887.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.72 : 1,909.94 = 887.69 : x
2. Step 2: Convert to fraction form
   1,383.72/1,909.94 = 887.69/x
3. Step 3: Cross multiply
   1,383.72x = 1,909.94 × 887.69
4. Step 4: Simplify right side
   1,383.72x = 1,695,420.65
5. Step 5: Solve for x
   x = 1,695,420.65/1,383.72
6. Step 6: Final answer
   x = 1,225.26