Finding the Fourth Proportional to 1,127.90, 1,556.69 and 708.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,127.90 : 1,556.69 = 708.60 : x
2. Step 2: Convert to fraction form
   1,127.90/1,556.69 = 708.60/x
3. Step 3: Cross multiply
   1,127.90x = 1,556.69 × 708.60
4. Step 4: Simplify right side
   1,127.90x = 1,103,072.31
5. Step 5: Solve for x
   x = 1,103,072.31/1,127.90
6. Step 6: Final answer
   x = 977.99