Finding the Fourth Proportional to 3,320.65, 4,981.78 and 1,012.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,320.65 : 4,981.78 = 1,012.15 : x
2. Step 2: Convert to fraction form
   3,320.65/4,981.78 = 1,012.15/x
3. Step 3: Cross multiply
   3,320.65x = 4,981.78 × 1,012.15
4. Step 4: Simplify right side
   3,320.65x = 5,042,308.63
5. Step 5: Solve for x
   x = 5,042,308.63/3,320.65
6. Step 6: Final answer
   x = 1,518.47