Finding the Fourth Proportional to 3,935.34, 5,430.89 and 2,142.94

Step by Step Solution

1. Step 1: Write the proportion equation
   3,935.34 : 5,430.89 = 2,142.94 : x
2. Step 2: Convert to fraction form
   3,935.34/5,430.89 = 2,142.94/x
3. Step 3: Cross multiply
   3,935.34x = 5,430.89 × 2,142.94
4. Step 4: Simplify right side
   3,935.34x = 11,638,047.12
5. Step 5: Solve for x
   x = 11,638,047.12/3,935.34
6. Step 6: Final answer
   x = 2,957.32