Finding the Fourth Proportional to 1,086.84, 1,620.72 and 1,077.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.84 : 1,620.72 = 1,077.12 : x
2. Step 2: Convert to fraction form
   1,086.84/1,620.72 = 1,077.12/x
3. Step 3: Cross multiply
   1,086.84x = 1,620.72 × 1,077.12
4. Step 4: Simplify right side
   1,086.84x = 1,745,709.93
5. Step 5: Solve for x
   x = 1,745,709.93/1,086.84
6. Step 6: Final answer
   x = 1,606.23