Finding the Fourth Proportional to 1,288.35, 1,776.04 and 845.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288.35 : 1,776.04 = 845.47 : x
2. Step 2: Convert to fraction form
   1,288.35/1,776.04 = 845.47/x
3. Step 3: Cross multiply
   1,288.35x = 1,776.04 × 845.47
4. Step 4: Simplify right side
   1,288.35x = 1,501,588.54
5. Step 5: Solve for x
   x = 1,501,588.54/1,288.35
6. Step 6: Final answer
   x = 1,165.51