Finding the Fourth Proportional to 1,077.17, 1,615.74 and 711.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.17 : 1,615.74 = 711.87 : x
2. Step 2: Convert to fraction form
   1,077.17/1,615.74 = 711.87/x
3. Step 3: Cross multiply
   1,077.17x = 1,615.74 × 711.87
4. Step 4: Simplify right side
   1,077.17x = 1,150,196.83
5. Step 5: Solve for x
   x = 1,150,196.83/1,077.17
6. Step 6: Final answer
   x = 1,067.80