Finding the Fourth Proportional to 28,499.05, 42,753.17 and 8,777.60

Step by Step Solution

1. Step 1: Write the proportion equation
   28,499.05 : 42,753.17 = 8,777.60 : x
2. Step 2: Convert to fraction form
   28,499.05/42,753.17 = 8,777.60/x
3. Step 3: Cross multiply
   28,499.05x = 42,753.17 × 8,777.60
4. Step 4: Simplify right side
   28,499.05x = 375,270,144.12
5. Step 5: Solve for x
   x = 375,270,144.12/28,499.05
6. Step 6: Final answer
   x = 13,167.81