Finding the Fourth Proportional to 1,172.50, 1,618.12 and 648.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.50 : 1,618.12 = 648.52 : x
2. Step 2: Convert to fraction form
   1,172.50/1,618.12 = 648.52/x
3. Step 3: Cross multiply
   1,172.50x = 1,618.12 × 648.52
4. Step 4: Simplify right side
   1,172.50x = 1,049,383.18
5. Step 5: Solve for x
   x = 1,049,383.18/1,172.50
6. Step 6: Final answer
   x = 895.00