Finding the Fourth Proportional to 1,218.02, 1,669.93 and 1,196.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,218.02 : 1,669.93 = 1,196.15 : x
2. Step 2: Convert to fraction form
   1,218.02/1,669.93 = 1,196.15/x
3. Step 3: Cross multiply
   1,218.02x = 1,669.93 × 1,196.15
4. Step 4: Simplify right side
   1,218.02x = 1,997,475.43
5. Step 5: Solve for x
   x = 1,997,475.43/1,218.02
6. Step 6: Final answer
   x = 1,639.94