Finding the Fourth Proportional to 1,384.34, 1,909.86 and 886.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.34 : 1,909.86 = 886.91 : x
2. Step 2: Convert to fraction form
   1,384.34/1,909.86 = 886.91/x
3. Step 3: Cross multiply
   1,384.34x = 1,909.86 × 886.91
4. Step 4: Simplify right side
   1,384.34x = 1,693,864.38
5. Step 5: Solve for x
   x = 1,693,864.38/1,384.34
6. Step 6: Final answer
   x = 1,223.59