Finding the Fourth Proportional to 910.69, 1,251.89 and 784.18

Step by Step Solution

1. Step 1: Write the proportion equation
   910.69 : 1,251.89 = 784.18 : x
2. Step 2: Convert to fraction form
   910.69/1,251.89 = 784.18/x
3. Step 3: Cross multiply
   910.69x = 1,251.89 × 784.18
4. Step 4: Simplify right side
   910.69x = 981,707.10
5. Step 5: Solve for x
   x = 981,707.10/910.69
6. Step 6: Final answer
   x = 1,077.98