Finding the Fourth Proportional to 17,664.78, 26,478.72 and 12,977.82

Step by Step Solution

1. Step 1: Write the proportion equation
   17,664.78 : 26,478.72 = 12,977.82 : x
2. Step 2: Convert to fraction form
   17,664.78/26,478.72 = 12,977.82/x
3. Step 3: Cross multiply
   17,664.78x = 26,478.72 × 12,977.82
4. Step 4: Simplify right side
   17,664.78x = 343,636,061.99
5. Step 5: Solve for x
   x = 343,636,061.99/17,664.78
6. Step 6: Final answer
   x = 19,453.18