Finding the Fourth Proportional to 9,107.60, 12,568.36 and 5,128.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,107.60 : 12,568.36 = 5,128.76 : x
2. Step 2: Convert to fraction form
   9,107.60/12,568.36 = 5,128.76/x
3. Step 3: Cross multiply
   9,107.60x = 12,568.36 × 5,128.76
4. Step 4: Simplify right side
   9,107.60x = 64,460,026.37
5. Step 5: Solve for x
   x = 64,460,026.37/9,107.60
6. Step 6: Final answer
   x = 7,077.61