Finding the Fourth Proportional to 13,485.78, 18,611.02 and 7,517.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,485.78 : 18,611.02 = 7,517.50 : x
2. Step 2: Convert to fraction form
   13,485.78/18,611.02 = 7,517.50/x
3. Step 3: Cross multiply
   13,485.78x = 18,611.02 × 7,517.50
4. Step 4: Simplify right side
   13,485.78x = 139,908,342.85
5. Step 5: Solve for x
   x = 139,908,342.85/13,485.78
6. Step 6: Final answer
   x = 10,374.51