Finding the Fourth Proportional to 1,384.83, 1,910.34 and 991.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.83 : 1,910.34 = 991.17 : x
2. Step 2: Convert to fraction form
   1,384.83/1,910.34 = 991.17/x
3. Step 3: Cross multiply
   1,384.83x = 1,910.34 × 991.17
4. Step 4: Simplify right side
   1,384.83x = 1,893,471.70
5. Step 5: Solve for x
   x = 1,893,471.70/1,384.83
6. Step 6: Final answer
   x = 1,367.30