Finding the Fourth Proportional to 12,637.84, 17,436.72 and 8,161.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,637.84 : 17,436.72 = 8,161.78 : x
2. Step 2: Convert to fraction form
   12,637.84/17,436.72 = 8,161.78/x
3. Step 3: Cross multiply
   12,637.84x = 17,436.72 × 8,161.78
4. Step 4: Simplify right side
   12,637.84x = 142,314,672.56
5. Step 5: Solve for x
   x = 142,314,672.56/12,637.84
6. Step 6: Final answer
   x = 11,261.00