Finding the Fourth Proportional to 1,172.01, 1,617.24 and 647.95

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.01 : 1,617.24 = 647.95 : x
2. Step 2: Convert to fraction form
   1,172.01/1,617.24 = 647.95/x
3. Step 3: Cross multiply
   1,172.01x = 1,617.24 × 647.95
4. Step 4: Simplify right side
   1,172.01x = 1,047,887.42
5. Step 5: Solve for x
   x = 1,047,887.42/1,172.01
6. Step 6: Final answer
   x = 894.09