Finding the Fourth Proportional to 1,191.56, 1,645.43 and 896.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,191.56 : 1,645.43 = 896.31 : x
2. Step 2: Convert to fraction form
   1,191.56/1,645.43 = 896.31/x
3. Step 3: Cross multiply
   1,191.56x = 1,645.43 × 896.31
4. Step 4: Simplify right side
   1,191.56x = 1,474,810.88
5. Step 5: Solve for x
   x = 1,474,810.88/1,191.56
6. Step 6: Final answer
   x = 1,237.72