Finding the Fourth Proportional to 13,380.76, 18,461.28 and 7,714.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,380.76 : 18,461.28 = 7,714.78 : x
2. Step 2: Convert to fraction form
   13,380.76/18,461.28 = 7,714.78/x
3. Step 3: Cross multiply
   13,380.76x = 18,461.28 × 7,714.78
4. Step 4: Simplify right side
   13,380.76x = 142,424,696.50
5. Step 5: Solve for x
   x = 142,424,696.50/13,380.76
6. Step 6: Final answer
   x = 10,643.99