Finding the Fourth Proportional to 12,429.60, 17,152.34 and 7,120.74

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.60 : 17,152.34 = 7,120.74 : x
2. Step 2: Convert to fraction form
   12,429.60/17,152.34 = 7,120.74/x
3. Step 3: Cross multiply
   12,429.60x = 17,152.34 × 7,120.74
4. Step 4: Simplify right side
   12,429.60x = 122,137,353.53
5. Step 5: Solve for x
   x = 122,137,353.53/12,429.60
6. Step 6: Final answer
   x = 9,826.33