Finding the Fourth Proportional to 9,109.37, 12,570.87 and 5,131.77

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.37 : 12,570.87 = 5,131.77 : x
2. Step 2: Convert to fraction form
   9,109.37/12,570.87 = 5,131.77/x
3. Step 3: Cross multiply
   9,109.37x = 12,570.87 × 5,131.77
4. Step 4: Simplify right side
   9,109.37x = 64,510,785.64
5. Step 5: Solve for x
   x = 64,510,785.64/9,109.37
6. Step 6: Final answer
   x = 7,081.80