Finding the Fourth Proportional to 1,216.69, 1,677.38 and 1,178.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,216.69 : 1,677.38 = 1,178.42 : x
2. Step 2: Convert to fraction form
   1,216.69/1,677.38 = 1,178.42/x
3. Step 3: Cross multiply
   1,216.69x = 1,677.38 × 1,178.42
4. Step 4: Simplify right side
   1,216.69x = 1,976,643.86
5. Step 5: Solve for x
   x = 1,976,643.86/1,216.69
6. Step 6: Final answer
   x = 1,624.61