Finding the Fourth Proportional to 1,433.86, 1,978.73 and 836.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.86 : 1,978.73 = 836.77 : x
2. Step 2: Convert to fraction form
   1,433.86/1,978.73 = 836.77/x
3. Step 3: Cross multiply
   1,433.86x = 1,978.73 × 836.77
4. Step 4: Simplify right side
   1,433.86x = 1,655,740.22
5. Step 5: Solve for x
   x = 1,655,740.22/1,433.86
6. Step 6: Final answer
   x = 1,154.74