Finding the Fourth Proportional to 1,019.55, 1,528.18 and 434.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.55 : 1,528.18 = 434.37 : x
2. Step 2: Convert to fraction form
   1,019.55/1,528.18 = 434.37/x
3. Step 3: Cross multiply
   1,019.55x = 1,528.18 × 434.37
4. Step 4: Simplify right side
   1,019.55x = 663,795.55
5. Step 5: Solve for x
   x = 663,795.55/1,019.55
6. Step 6: Final answer
   x = 651.07