Finding the Fourth Proportional to 13,279.74, 18,323.10 and 7,687.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,279.74 : 18,323.10 = 7,687.50 : x
2. Step 2: Convert to fraction form
   13,279.74/18,323.10 = 7,687.50/x
3. Step 3: Cross multiply
   13,279.74x = 18,323.10 × 7,687.50
4. Step 4: Simplify right side
   13,279.74x = 140,858,831.25
5. Step 5: Solve for x
   x = 140,858,831.25/13,279.74
6. Step 6: Final answer
   x = 10,607.05