Finding the Fourth Proportional to 13,538.60, 18,680.98 and 7,570.31

Step by Step Solution

1. Step 1: Write the proportion equation
   13,538.60 : 18,680.98 = 7,570.31 : x
2. Step 2: Convert to fraction form
   13,538.60/18,680.98 = 7,570.31/x
3. Step 3: Cross multiply
   13,538.60x = 18,680.98 × 7,570.31
4. Step 4: Simplify right side
   13,538.60x = 141,420,771.85
5. Step 5: Solve for x
   x = 141,420,771.85/13,538.60
6. Step 6: Final answer
   x = 10,445.75