Finding the Fourth Proportional to 1,100.67, 1,518.60 and 708.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.67 : 1,518.60 = 708.21 : x
2. Step 2: Convert to fraction form
   1,100.67/1,518.60 = 708.21/x
3. Step 3: Cross multiply
   1,100.67x = 1,518.60 × 708.21
4. Step 4: Simplify right side
   1,100.67x = 1,075,487.71
5. Step 5: Solve for x
   x = 1,075,487.71/1,100.67
6. Step 6: Final answer
   x = 977.12