Finding the Fourth Proportional to 12,623.72, 17,417.94 and 8,429

Step by Step Solution

1. Step 1: Write the proportion equation
   12,623.72 : 17,417.94 = 8,429 : x
2. Step 2: Convert to fraction form
   12,623.72/17,417.94 = 8,429/x
3. Step 3: Cross multiply
   12,623.72x = 17,417.94 × 8,429
4. Step 4: Simplify right side
   12,623.72x = 146,815,816.26
5. Step 5: Solve for x
   x = 146,815,816.26/12,623.72
6. Step 6: Final answer
   x = 11,630.15