Finding the Fourth Proportional to 12,988.58, 19,504.89 and 12,322.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,988.58 : 19,504.89 = 12,322.76 : x
2. Step 2: Convert to fraction form
   12,988.58/19,504.89 = 12,322.76/x
3. Step 3: Cross multiply
   12,988.58x = 19,504.89 × 12,322.76
4. Step 4: Simplify right side
   12,988.58x = 240,353,980.77
5. Step 5: Solve for x
   x = 240,353,980.77/12,988.58
6. Step 6: Final answer
   x = 18,505.03