Finding the Fourth Proportional to 784.38, 1,081.59 and 776.48

Step by Step Solution

1. Step 1: Write the proportion equation
   784.38 : 1,081.59 = 776.48 : x
2. Step 2: Convert to fraction form
   784.38/1,081.59 = 776.48/x
3. Step 3: Cross multiply
   784.38x = 1,081.59 × 776.48
4. Step 4: Simplify right side
   784.38x = 839,833.00
5. Step 5: Solve for x
   x = 839,833.00/784.38
6. Step 6: Final answer
   x = 1,070.70