Finding the Fourth Proportional to 910.91, 1,359.72 and 801.56

Step by Step Solution

1. Step 1: Write the proportion equation
   910.91 : 1,359.72 = 801.56 : x
2. Step 2: Convert to fraction form
   910.91/1,359.72 = 801.56/x
3. Step 3: Cross multiply
   910.91x = 1,359.72 × 801.56
4. Step 4: Simplify right side
   910.91x = 1,089,900.56
5. Step 5: Solve for x
   x = 1,089,900.56/910.91
6. Step 6: Final answer
   x = 1,196.49