Finding the Fourth Proportional to 1,020.07, 1,407.69 and 554.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,020.07 : 1,407.69 = 554.32 : x
2. Step 2: Convert to fraction form
   1,020.07/1,407.69 = 554.32/x
3. Step 3: Cross multiply
   1,020.07x = 1,407.69 × 554.32
4. Step 4: Simplify right side
   1,020.07x = 780,310.72
5. Step 5: Solve for x
   x = 780,310.72/1,020.07
6. Step 6: Final answer
   x = 764.96