Finding the Fourth Proportional to 10,209.12, 15,228.86 and 10,039.96

Step by Step Solution

1. Step 1: Write the proportion equation
   10,209.12 : 15,228.86 = 10,039.96 : x
2. Step 2: Convert to fraction form
   10,209.12/15,228.86 = 10,039.96/x
3. Step 3: Cross multiply
   10,209.12x = 15,228.86 × 10,039.96
4. Step 4: Simplify right side
   10,209.12x = 152,897,145.25
5. Step 5: Solve for x
   x = 152,897,145.25/10,209.12
6. Step 6: Final answer
   x = 14,976.53