Finding the Fourth Proportional to 13,056.76, 17,988.78 and 12,434.68

Step by Step Solution

1. Step 1: Write the proportion equation
   13,056.76 : 17,988.78 = 12,434.68 : x
2. Step 2: Convert to fraction form
   13,056.76/17,988.78 = 12,434.68/x
3. Step 3: Cross multiply
   13,056.76x = 17,988.78 × 12,434.68
4. Step 4: Simplify right side
   13,056.76x = 223,684,722.89
5. Step 5: Solve for x
   x = 223,684,722.89/13,056.76
6. Step 6: Final answer
   x = 17,131.72