Finding the Fourth Proportional to 12,624.32, 17,421.56 and 7,322.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,624.32 : 17,421.56 = 7,322.20 : x
2. Step 2: Convert to fraction form
   12,624.32/17,421.56 = 7,322.20/x
3. Step 3: Cross multiply
   12,624.32x = 17,421.56 × 7,322.20
4. Step 4: Simplify right side
   12,624.32x = 127,564,146.63
5. Step 5: Solve for x
   x = 127,564,146.63/12,624.32
6. Step 6: Final answer
   x = 10,104.64