Finding the Fourth Proportional to 1,384.69, 1,910.40 and 887.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.69 : 1,910.40 = 887.64 : x
2. Step 2: Convert to fraction form
   1,384.69/1,910.40 = 887.64/x
3. Step 3: Cross multiply
   1,384.69x = 1,910.40 × 887.64
4. Step 4: Simplify right side
   1,384.69x = 1,695,747.46
5. Step 5: Solve for x
   x = 1,695,747.46/1,384.69
6. Step 6: Final answer
   x = 1,224.64