Finding the Fourth Proportional to 1,077.00, 1,485.89 and 657.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.00 : 1,485.89 = 657.20 : x
2. Step 2: Convert to fraction form
   1,077.00/1,485.89 = 657.20/x
3. Step 3: Cross multiply
   1,077.00x = 1,485.89 × 657.20
4. Step 4: Simplify right side
   1,077.00x = 976,525.14
5. Step 5: Solve for x
   x = 976,525.14/1,077.00
6. Step 6: Final answer
   x = 906.71