Finding the Fourth Proportional to 10,113.59, 15,173.99 and 5,185.55

Step by Step Solution

1. Step 1: Write the proportion equation
   10,113.59 : 15,173.99 = 5,185.55 : x
2. Step 2: Convert to fraction form
   10,113.59/15,173.99 = 5,185.55/x
3. Step 3: Cross multiply
   10,113.59x = 15,173.99 × 5,185.55
4. Step 4: Simplify right side
   10,113.59x = 78,685,483.84
5. Step 5: Solve for x
   x = 78,685,483.84/10,113.59
6. Step 6: Final answer
   x = 7,780.17