Finding the Fourth Proportional to 9,100.35, 12,557.16 and 5,120.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,100.35 : 12,557.16 = 5,120.69 : x
2. Step 2: Convert to fraction form
   9,100.35/12,557.16 = 5,120.69/x
3. Step 3: Cross multiply
   9,100.35x = 12,557.16 × 5,120.69
4. Step 4: Simplify right side
   9,100.35x = 64,301,260.85
5. Step 5: Solve for x
   x = 64,301,260.85/9,100.35
6. Step 6: Final answer
   x = 7,065.80