Finding the Fourth Proportional to 5,112.30, 7,171.80 and 5,112.30

Step by Step Solution

1. Step 1: Write the proportion equation
   5,112.30 : 7,171.80 = 5,112.30 : x
2. Step 2: Convert to fraction form
   5,112.30/7,171.80 = 5,112.30/x
3. Step 3: Cross multiply
   5,112.30x = 7,171.80 × 5,112.30
4. Step 4: Simplify right side
   5,112.30x = 36,664,393.14
5. Step 5: Solve for x
   x = 36,664,393.14/5,112.30
6. Step 6: Final answer
   x = 7,171.80