Finding the Fourth Proportional to 13,445.58, 18,553.71 and 7,855.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,445.58 : 18,553.71 = 7,855.50 : x
2. Step 2: Convert to fraction form
   13,445.58/18,553.71 = 7,855.50/x
3. Step 3: Cross multiply
   13,445.58x = 18,553.71 × 7,855.50
4. Step 4: Simplify right side
   13,445.58x = 145,748,668.91
5. Step 5: Solve for x
   x = 145,748,668.91/13,445.58
6. Step 6: Final answer
   x = 10,839.89