Finding the Fourth Proportional to 12,900.86, 17,803.38 and 7,236.86

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.86 : 17,803.38 = 7,236.86 : x
2. Step 2: Convert to fraction form
   12,900.86/17,803.38 = 7,236.86/x
3. Step 3: Cross multiply
   12,900.86x = 17,803.38 × 7,236.86
4. Step 4: Simplify right side
   12,900.86x = 128,840,640.23
5. Step 5: Solve for x
   x = 128,840,640.23/12,900.86
6. Step 6: Final answer
   x = 9,986.98