Finding the Fourth Proportional to 3,100.55, 4,331.05 and 3,100.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,100.55 : 4,331.05 = 3,100.55 : x
2. Step 2: Convert to fraction form
   3,100.55/4,331.05 = 3,100.55/x
3. Step 3: Cross multiply
   3,100.55x = 4,331.05 × 3,100.55
4. Step 4: Simplify right side
   3,100.55x = 13,428,637.08
5. Step 5: Solve for x
   x = 13,428,637.08/3,100.55
6. Step 6: Final answer
   x = 4,331.05