Finding the Fourth Proportional to 11,100.79, 16,636.60 and 5,259.07

Step by Step Solution

1. Step 1: Write the proportion equation
   11,100.79 : 16,636.60 = 5,259.07 : x
2. Step 2: Convert to fraction form
   11,100.79/16,636.60 = 5,259.07/x
3. Step 3: Cross multiply
   11,100.79x = 16,636.60 × 5,259.07
4. Step 4: Simplify right side
   11,100.79x = 87,492,989.22
5. Step 5: Solve for x
   x = 87,492,989.22/11,100.79
6. Step 6: Final answer
   x = 7,881.69