Finding the Fourth Proportional to 20,977.86, 31,477.72 and 8,507.10

Step by Step Solution

1. Step 1: Write the proportion equation
   20,977.86 : 31,477.72 = 8,507.10 : x
2. Step 2: Convert to fraction form
   20,977.86/31,477.72 = 8,507.10/x
3. Step 3: Cross multiply
   20,977.86x = 31,477.72 × 8,507.10
4. Step 4: Simplify right side
   20,977.86x = 267,784,111.81
5. Step 5: Solve for x
   x = 267,784,111.81/20,977.86
6. Step 6: Final answer
   x = 12,765.08