Finding the Fourth Proportional to 11,980.32, 16,533.72 and 7,800.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,980.32 : 16,533.72 = 7,800.72 : x
2. Step 2: Convert to fraction form
   11,980.32/16,533.72 = 7,800.72/x
3. Step 3: Cross multiply
   11,980.32x = 16,533.72 × 7,800.72
4. Step 4: Simplify right side
   11,980.32x = 128,974,920.28
5. Step 5: Solve for x
   x = 128,974,920.28/11,980.32
6. Step 6: Final answer
   x = 10,765.57