Finding the Fourth Proportional to 28,499.73, 42,749.69 and 8,778.18

Step by Step Solution

1. Step 1: Write the proportion equation
   28,499.73 : 42,749.69 = 8,778.18 : x
2. Step 2: Convert to fraction form
   28,499.73/42,749.69 = 8,778.18/x
3. Step 3: Cross multiply
   28,499.73x = 42,749.69 × 8,778.18
4. Step 4: Simplify right side
   28,499.73x = 375,264,473.76
5. Step 5: Solve for x
   x = 375,264,473.76/28,499.73
6. Step 6: Final answer
   x = 13,167.30