Finding the Fourth Proportional to 13,196.58, 18,211.30 and 7,146.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,196.58 : 18,211.30 = 7,146.88 : x
2. Step 2: Convert to fraction form
   13,196.58/18,211.30 = 7,146.88/x
3. Step 3: Cross multiply
   13,196.58x = 18,211.30 × 7,146.88
4. Step 4: Simplify right side
   13,196.58x = 130,153,975.74
5. Step 5: Solve for x
   x = 130,153,975.74/13,196.58
6. Step 6: Final answer
   x = 9,862.71