Finding the Fourth Proportional to 11,420.76, 17,122.86 and 7,713.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,420.76 : 17,122.86 = 7,713.72 : x
2. Step 2: Convert to fraction form
   11,420.76/17,122.86 = 7,713.72/x
3. Step 3: Cross multiply
   11,420.76x = 17,122.86 × 7,713.72
4. Step 4: Simplify right side
   11,420.76x = 132,080,947.64
5. Step 5: Solve for x
   x = 132,080,947.64/11,420.76
6. Step 6: Final answer
   x = 11,564.99