Finding the Fourth Proportional to 8,785.79, 12,120.32 and 5,057.63

Step by Step Solution

1. Step 1: Write the proportion equation
   8,785.79 : 12,120.32 = 5,057.63 : x
2. Step 2: Convert to fraction form
   8,785.79/12,120.32 = 5,057.63/x
3. Step 3: Cross multiply
   8,785.79x = 12,120.32 × 5,057.63
4. Step 4: Simplify right side
   8,785.79x = 61,300,008.15
5. Step 5: Solve for x
   x = 61,300,008.15/8,785.79
6. Step 6: Final answer
   x = 6,977.18