Finding the Fourth Proportional to 1,385.48, 1,909.94 and 991.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.48 : 1,909.94 = 991.82 : x
2. Step 2: Convert to fraction form
   1,385.48/1,909.94 = 991.82/x
3. Step 3: Cross multiply
   1,385.48x = 1,909.94 × 991.82
4. Step 4: Simplify right side
   1,385.48x = 1,894,316.69
5. Step 5: Solve for x
   x = 1,894,316.69/1,385.48
6. Step 6: Final answer
   x = 1,367.26