Finding the Fourth Proportional to 860.69, 1,295.69 and 784.15

Step by Step Solution

1. Step 1: Write the proportion equation
   860.69 : 1,295.69 = 784.15 : x
2. Step 2: Convert to fraction form
   860.69/1,295.69 = 784.15/x
3. Step 3: Cross multiply
   860.69x = 1,295.69 × 784.15
4. Step 4: Simplify right side
   860.69x = 1,016,008.15
5. Step 5: Solve for x
   x = 1,016,008.15/860.69
6. Step 6: Final answer
   x = 1,180.45