Finding the Fourth Proportional to 10,152.25, 15,191.45 and 8,380.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,152.25 : 15,191.45 = 8,380.78 : x
2. Step 2: Convert to fraction form
   10,152.25/15,191.45 = 8,380.78/x
3. Step 3: Cross multiply
   10,152.25x = 15,191.45 × 8,380.78
4. Step 4: Simplify right side
   10,152.25x = 127,316,124.37
5. Step 5: Solve for x
   x = 127,316,124.37/10,152.25
6. Step 6: Final answer
   x = 12,540.69