Finding the Fourth Proportional to 1,544.32, 2,131.52 and 991.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,544.32 : 2,131.52 = 991.36 : x
2. Step 2: Convert to fraction form
   1,544.32/2,131.52 = 991.36/x
3. Step 3: Cross multiply
   1,544.32x = 2,131.52 × 991.36
4. Step 4: Simplify right side
   1,544.32x = 2,113,103.67
5. Step 5: Solve for x
   x = 2,113,103.67/1,544.32
6. Step 6: Final answer
   x = 1,368.31