Finding the Fourth Proportional to 17,666.94, 26,442.72 and 12,985.72

Step by Step Solution

1. Step 1: Write the proportion equation
   17,666.94 : 26,442.72 = 12,985.72 : x
2. Step 2: Convert to fraction form
   17,666.94/26,442.72 = 12,985.72/x
3. Step 3: Cross multiply
   17,666.94x = 26,442.72 × 12,985.72
4. Step 4: Simplify right side
   17,666.94x = 343,377,757.96
5. Step 5: Solve for x
   x = 343,377,757.96/17,666.94
6. Step 6: Final answer
   x = 19,436.18