Finding the Fourth Proportional to 1,308.05, 1,804.88 and 784.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.05 : 1,804.88 = 784.10 : x
2. Step 2: Convert to fraction form
   1,308.05/1,804.88 = 784.10/x
3. Step 3: Cross multiply
   1,308.05x = 1,804.88 × 784.10
4. Step 4: Simplify right side
   1,308.05x = 1,415,199.34
5. Step 5: Solve for x
   x = 1,415,199.34/1,308.05
6. Step 6: Final answer
   x = 1,081.91