Finding the Fourth Proportional to 3,945.63, 5,917.98 and 1,172.02

Step by Step Solution

1. Step 1: Write the proportion equation
   3,945.63 : 5,917.98 = 1,172.02 : x
2. Step 2: Convert to fraction form
   3,945.63/5,917.98 = 1,172.02/x
3. Step 3: Cross multiply
   3,945.63x = 5,917.98 × 1,172.02
4. Step 4: Simplify right side
   3,945.63x = 6,935,985.02
5. Step 5: Solve for x
   x = 6,935,985.02/3,945.63
6. Step 6: Final answer
   x = 1,757.89