Finding the Fourth Proportional to 6,931.89, 10,400.42 and 4,160.55

Step by Step Solution

1. Step 1: Write the proportion equation
   6,931.89 : 10,400.42 = 4,160.55 : x
2. Step 2: Convert to fraction form
   6,931.89/10,400.42 = 4,160.55/x
3. Step 3: Cross multiply
   6,931.89x = 10,400.42 × 4,160.55
4. Step 4: Simplify right side
   6,931.89x = 43,271,467.43
5. Step 5: Solve for x
   x = 43,271,467.43/6,931.89
6. Step 6: Final answer
   x = 6,242.38