Finding the Fourth Proportional to 13,168.79, 19,753.21 and 5,377.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,168.79 : 19,753.21 = 5,377.61 : x
2. Step 2: Convert to fraction form
   13,168.79/19,753.21 = 5,377.61/x
3. Step 3: Cross multiply
   13,168.79x = 19,753.21 × 5,377.61
4. Step 4: Simplify right side
   13,168.79x = 106,224,989.50
5. Step 5: Solve for x
   x = 106,224,989.50/13,168.79
6. Step 6: Final answer
   x = 8,066.42