Finding the Fourth Proportional to 12,762.76, 17,612.42 and 7,173.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,762.76 : 17,612.42 = 7,173.72 : x
2. Step 2: Convert to fraction form
   12,762.76/17,612.42 = 7,173.72/x
3. Step 3: Cross multiply
   12,762.76x = 17,612.42 × 7,173.72
4. Step 4: Simplify right side
   12,762.76x = 126,346,569.60
5. Step 5: Solve for x
   x = 126,346,569.60/12,762.76
6. Step 6: Final answer
   x = 9,899.63