Finding the Fourth Proportional to 1,218.07, 1,680.89 and 776.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218.07 : 1,680.89 = 776.12 : x
2. Step 2: Convert to fraction form
   1,218.07/1,680.89 = 776.12/x
3. Step 3: Cross multiply
   1,218.07x = 1,680.89 × 776.12
4. Step 4: Simplify right side
   1,218.07x = 1,304,560.06
5. Step 5: Solve for x
   x = 1,304,560.06/1,218.07
6. Step 6: Final answer
   x = 1,071.00