Finding the Fourth Proportional to 9,156.87, 12,636.27 and 5,177.75

Step by Step Solution

1. Step 1: Write the proportion equation
   9,156.87 : 12,636.27 = 5,177.75 : x
2. Step 2: Convert to fraction form
   9,156.87/12,636.27 = 5,177.75/x
3. Step 3: Cross multiply
   9,156.87x = 12,636.27 × 5,177.75
4. Step 4: Simplify right side
   9,156.87x = 65,427,383.81
5. Step 5: Solve for x
   x = 65,427,383.81/9,156.87
6. Step 6: Final answer
   x = 7,145.17