Finding the Fourth Proportional to 12,911.61, 17,818.61 and 10,112.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,911.61 : 17,818.61 = 10,112.25 : x
2. Step 2: Convert to fraction form
   12,911.61/17,818.61 = 10,112.25/x
3. Step 3: Cross multiply
   12,911.61x = 17,818.61 × 10,112.25
4. Step 4: Simplify right side
   12,911.61x = 180,186,188.41
5. Step 5: Solve for x
   x = 180,186,188.41/12,911.61
6. Step 6: Final answer
   x = 13,955.36