Finding the Fourth Proportional to 1,051.88, 1,577.00 and 685.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,051.88 : 1,577.00 = 685.55 : x
2. Step 2: Convert to fraction form
   1,051.88/1,577.00 = 685.55/x
3. Step 3: Cross multiply
   1,051.88x = 1,577.00 × 685.55
4. Step 4: Simplify right side
   1,051.88x = 1,081,101.04
5. Step 5: Solve for x
   x = 1,081,101.04/1,051.88
6. Step 6: Final answer
   x = 1,027.78