Finding the Fourth Proportional to 5,155.17, 7,128.09 and 5,071.77

Step by Step Solution

1. Step 1: Write the proportion equation
   5,155.17 : 7,128.09 = 5,071.77 : x
2. Step 2: Convert to fraction form
   5,155.17/7,128.09 = 5,071.77/x
3. Step 3: Cross multiply
   5,155.17x = 7,128.09 × 5,071.77
4. Step 4: Simplify right side
   5,155.17x = 36,152,033.02
5. Step 5: Solve for x
   x = 36,152,033.02/5,155.17
6. Step 6: Final answer
   x = 7,012.77