Finding the Fourth Proportional to 1,091.74, 1,505.67 and 672.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,091.74 : 1,505.67 = 672.10 : x
2. Step 2: Convert to fraction form
   1,091.74/1,505.67 = 672.10/x
3. Step 3: Cross multiply
   1,091.74x = 1,505.67 × 672.10
4. Step 4: Simplify right side
   1,091.74x = 1,011,960.81
5. Step 5: Solve for x
   x = 1,011,960.81/1,091.74
6. Step 6: Final answer
   x = 926.92