Finding the Fourth Proportional to 10,188.78, 14,059.54 and 5,712.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,188.78 : 14,059.54 = 5,712.72 : x
2. Step 2: Convert to fraction form
   10,188.78/14,059.54 = 5,712.72/x
3. Step 3: Cross multiply
   10,188.78x = 14,059.54 × 5,712.72
4. Step 4: Simplify right side
   10,188.78x = 80,318,215.35
5. Step 5: Solve for x
   x = 80,318,215.35/10,188.78
6. Step 6: Final answer
   x = 7,883.01