Finding the Fourth Proportional to 1,087.79, 1,501.60 and 773.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.79 : 1,501.60 = 773.10 : x
2. Step 2: Convert to fraction form
   1,087.79/1,501.60 = 773.10/x
3. Step 3: Cross multiply
   1,087.79x = 1,501.60 × 773.10
4. Step 4: Simplify right side
   1,087.79x = 1,160,885.03
5. Step 5: Solve for x
   x = 1,160,885.03/1,087.79
6. Step 6: Final answer
   x = 1,067.20