Finding the Fourth Proportional to 1,100.55, 1,518.78 and 708.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.55 : 1,518.78 = 708.09 : x
2. Step 2: Convert to fraction form
   1,100.55/1,518.78 = 708.09/x
3. Step 3: Cross multiply
   1,100.55x = 1,518.78 × 708.09
4. Step 4: Simplify right side
   1,100.55x = 1,075,432.93
5. Step 5: Solve for x
   x = 1,075,432.93/1,100.55
6. Step 6: Final answer
   x = 977.18