Finding the Fourth Proportional to 9,120.42, 12,587.18 and 5,141.90

Step by Step Solution

1. Step 1: Write the proportion equation
   9,120.42 : 12,587.18 = 5,141.90 : x
2. Step 2: Convert to fraction form
   9,120.42/12,587.18 = 5,141.90/x
3. Step 3: Cross multiply
   9,120.42x = 12,587.18 × 5,141.90
4. Step 4: Simplify right side
   9,120.42x = 64,722,026.60
5. Step 5: Solve for x
   x = 64,722,026.60/9,120.42
6. Step 6: Final answer
   x = 7,096.39