Finding the Fourth Proportional to 2,527.20, 3,790.71 and 678.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,527.20 : 3,790.71 = 678.22 : x
2. Step 2: Convert to fraction form
   2,527.20/3,790.71 = 678.22/x
3. Step 3: Cross multiply
   2,527.20x = 3,790.71 × 678.22
4. Step 4: Simplify right side
   2,527.20x = 2,570,935.34
5. Step 5: Solve for x
   x = 2,570,935.34/2,527.20
6. Step 6: Final answer
   x = 1,017.31