Finding the Fourth Proportional to 13,780.45, 19,017.12 and 7,492.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,780.45 : 19,017.12 = 7,492.78 : x
2. Step 2: Convert to fraction form
   13,780.45/19,017.12 = 7,492.78/x
3. Step 3: Cross multiply
   13,780.45x = 19,017.12 × 7,492.78
4. Step 4: Simplify right side
   13,780.45x = 142,491,096.39
5. Step 5: Solve for x
   x = 142,491,096.39/13,780.45
6. Step 6: Final answer
   x = 10,340.09