Finding the Fourth Proportional to 1,435.13, 1,978.58 and 936.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.13 : 1,978.58 = 936.90 : x
2. Step 2: Convert to fraction form
   1,435.13/1,978.58 = 936.90/x
3. Step 3: Cross multiply
   1,435.13x = 1,978.58 × 936.90
4. Step 4: Simplify right side
   1,435.13x = 1,853,731.60
5. Step 5: Solve for x
   x = 1,853,731.60/1,435.13
6. Step 6: Final answer
   x = 1,291.68