Finding the Fourth Proportional to 5,142.66, 7,100.88 and 3,945.74

Step by Step Solution

1. Step 1: Write the proportion equation
   5,142.66 : 7,100.88 = 3,945.74 : x
2. Step 2: Convert to fraction form
   5,142.66/7,100.88 = 3,945.74/x
3. Step 3: Cross multiply
   5,142.66x = 7,100.88 × 3,945.74
4. Step 4: Simplify right side
   5,142.66x = 28,018,215.89
5. Step 5: Solve for x
   x = 28,018,215.89/5,142.66
6. Step 6: Final answer
   x = 5,448.20