Finding the Fourth Proportional to 1,384.16, 1,909.05 and 886.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.16 : 1,909.05 = 886.84 : x
2. Step 2: Convert to fraction form
   1,384.16/1,909.05 = 886.84/x
3. Step 3: Cross multiply
   1,384.16x = 1,909.05 × 886.84
4. Step 4: Simplify right side
   1,384.16x = 1,693,028.89
5. Step 5: Solve for x
   x = 1,693,028.89/1,384.16
6. Step 6: Final answer
   x = 1,223.15