Finding the Fourth Proportional to 11,320.56, 15,623.28 and 7,785.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,320.56 : 15,623.28 = 7,785.72 : x
2. Step 2: Convert to fraction form
   11,320.56/15,623.28 = 7,785.72/x
3. Step 3: Cross multiply
   11,320.56x = 15,623.28 × 7,785.72
4. Step 4: Simplify right side
   11,320.56x = 121,638,483.56
5. Step 5: Solve for x
   x = 121,638,483.56/11,320.56
6. Step 6: Final answer
   x = 10,744.92