Finding the Fourth Proportional to 1,019.70, 1,528.18 and 556.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.70 : 1,528.18 = 556.79 : x
2. Step 2: Convert to fraction form
   1,019.70/1,528.18 = 556.79/x
3. Step 3: Cross multiply
   1,019.70x = 1,528.18 × 556.79
4. Step 4: Simplify right side
   1,019.70x = 850,875.34
5. Step 5: Solve for x
   x = 850,875.34/1,019.70
6. Step 6: Final answer
   x = 834.44