Finding the Fourth Proportional to 1,089.32, 1,629.72 and 914.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.32 : 1,629.72 = 914.98 : x
2. Step 2: Convert to fraction form
   1,089.32/1,629.72 = 914.98/x
3. Step 3: Cross multiply
   1,089.32x = 1,629.72 × 914.98
4. Step 4: Simplify right side
   1,089.32x = 1,491,161.21
5. Step 5: Solve for x
   x = 1,491,161.21/1,089.32
6. Step 6: Final answer
   x = 1,368.89