Finding the Fourth Proportional to 1,308.12, 1,804.82 and 784.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.12 : 1,804.82 = 784.05 : x
2. Step 2: Convert to fraction form
   1,308.12/1,804.82 = 784.05/x
3. Step 3: Cross multiply
   1,308.12x = 1,804.82 × 784.05
4. Step 4: Simplify right side
   1,308.12x = 1,415,069.12
5. Step 5: Solve for x
   x = 1,415,069.12/1,308.12
6. Step 6: Final answer
   x = 1,081.76