Finding the Fourth Proportional to 8,667.87, 12,989.24 and 4,715.77

Step by Step Solution

1. Step 1: Write the proportion equation
   8,667.87 : 12,989.24 = 4,715.77 : x
2. Step 2: Convert to fraction form
   8,667.87/12,989.24 = 4,715.77/x
3. Step 3: Cross multiply
   8,667.87x = 12,989.24 × 4,715.77
4. Step 4: Simplify right side
   8,667.87x = 61,254,268.31
5. Step 5: Solve for x
   x = 61,254,268.31/8,667.87
6. Step 6: Final answer
   x = 7,066.82