Finding the Fourth Proportional to 9,109.80, 12,572.10 and 5,131.26

Step by Step Solution

1. Step 1: Write the proportion equation
   9,109.80 : 12,572.10 = 5,131.26 : x
2. Step 2: Convert to fraction form
   9,109.80/12,572.10 = 5,131.26/x
3. Step 3: Cross multiply
   9,109.80x = 12,572.10 × 5,131.26
4. Step 4: Simplify right side
   9,109.80x = 64,510,713.85
5. Step 5: Solve for x
   x = 64,510,713.85/9,109.80
6. Step 6: Final answer
   x = 7,081.46