Finding the Fourth Proportional to 20,899.18, 31,328.78 and 7,748.02

Step by Step Solution

1. Step 1: Write the proportion equation
   20,899.18 : 31,328.78 = 7,748.02 : x
2. Step 2: Convert to fraction form
   20,899.18/31,328.78 = 7,748.02/x
3. Step 3: Cross multiply
   20,899.18x = 31,328.78 × 7,748.02
4. Step 4: Simplify right side
   20,899.18x = 242,736,014.02
5. Step 5: Solve for x
   x = 242,736,014.02/20,899.18
6. Step 6: Final answer
   x = 11,614.62