Finding the Fourth Proportional to 12,620.17, 17,415.90 and 7,242.18

Step by Step Solution

1. Step 1: Write the proportion equation
   12,620.17 : 17,415.90 = 7,242.18 : x
2. Step 2: Convert to fraction form
   12,620.17/17,415.90 = 7,242.18/x
3. Step 3: Cross multiply
   12,620.17x = 17,415.90 × 7,242.18
4. Step 4: Simplify right side
   12,620.17x = 126,128,959.37
5. Step 5: Solve for x
   x = 126,128,959.37/12,620.17
6. Step 6: Final answer
   x = 9,994.24