Finding the Fourth Proportional to 10,007.55, 13,821.03 and 7,612.79

Step by Step Solution

1. Step 1: Write the proportion equation
   10,007.55 : 13,821.03 = 7,612.79 : x
2. Step 2: Convert to fraction form
   10,007.55/13,821.03 = 7,612.79/x
3. Step 3: Cross multiply
   10,007.55x = 13,821.03 × 7,612.79
4. Step 4: Simplify right side
   10,007.55x = 105,216,529.87
5. Step 5: Solve for x
   x = 105,216,529.87/10,007.55
6. Step 6: Final answer
   x = 10,513.72