Finding the Fourth Proportional to 1,100.54, 1,518.78 and 708.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.54 : 1,518.78 = 708.10 : x
2. Step 2: Convert to fraction form
   1,100.54/1,518.78 = 708.10/x
3. Step 3: Cross multiply
   1,100.54x = 1,518.78 × 708.10
4. Step 4: Simplify right side
   1,100.54x = 1,075,448.12
5. Step 5: Solve for x
   x = 1,075,448.12/1,100.54
6. Step 6: Final answer
   x = 977.20