Finding the Fourth Proportional to 3,780.81, 5,670.57 and 1,007.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,780.81 : 5,670.57 = 1,007.78 : x
2. Step 2: Convert to fraction form
   3,780.81/5,670.57 = 1,007.78/x
3. Step 3: Cross multiply
   3,780.81x = 5,670.57 × 1,007.78
4. Step 4: Simplify right side
   3,780.81x = 5,714,662.46
5. Step 5: Solve for x
   x = 5,714,662.46/3,780.81
6. Step 6: Final answer
   x = 1,511.49