Finding the Fourth Proportional to 1,384.42, 2,076.72 and 518.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.42 : 2,076.72 = 518.62 : x
2. Step 2: Convert to fraction form
   1,384.42/2,076.72 = 518.62/x
3. Step 3: Cross multiply
   1,384.42x = 2,076.72 × 518.62
4. Step 4: Simplify right side
   1,384.42x = 1,077,028.53
5. Step 5: Solve for x
   x = 1,077,028.53/1,384.42
6. Step 6: Final answer
   x = 777.96