Finding the Fourth Proportional to 9,400.12, 12,972.02 and 5,151.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,400.12 : 12,972.02 = 5,151.15 : x
2. Step 2: Convert to fraction form
   9,400.12/12,972.02 = 5,151.15/x
3. Step 3: Cross multiply
   9,400.12x = 12,972.02 × 5,151.15
4. Step 4: Simplify right side
   9,400.12x = 66,820,820.82
5. Step 5: Solve for x
   x = 66,820,820.82/9,400.12
6. Step 6: Final answer
   x = 7,108.51