Finding the Fourth Proportional to 1,434.15, 1,976.73 and 991.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.15 : 1,976.73 = 991.08 : x
2. Step 2: Convert to fraction form
   1,434.15/1,976.73 = 991.08/x
3. Step 3: Cross multiply
   1,434.15x = 1,976.73 × 991.08
4. Step 4: Simplify right side
   1,434.15x = 1,959,097.57
5. Step 5: Solve for x
   x = 1,959,097.57/1,434.15
6. Step 6: Final answer
   x = 1,366.03