Finding the Fourth Proportional to 12,418.84, 17,145.30 and 7,705.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,418.84 : 17,145.30 = 7,705.72 : x
2. Step 2: Convert to fraction form
   12,418.84/17,145.30 = 7,705.72/x
3. Step 3: Cross multiply
   12,418.84x = 17,145.30 × 7,705.72
4. Step 4: Simplify right side
   12,418.84x = 132,116,881.12
5. Step 5: Solve for x
   x = 132,116,881.12/12,418.84
6. Step 6: Final answer
   x = 10,638.42