Finding the Fourth Proportional to 28,499.21, 42,753.40 and 8,777.76

Step by Step Solution

1. Step 1: Write the proportion equation
   28,499.21 : 42,753.40 = 8,777.76 : x
2. Step 2: Convert to fraction form
   28,499.21/42,753.40 = 8,777.76/x
3. Step 3: Cross multiply
   28,499.21x = 42,753.40 × 8,777.76
4. Step 4: Simplify right side
   28,499.21x = 375,278,892.56
5. Step 5: Solve for x
   x = 375,278,892.56/28,499.21
6. Step 6: Final answer
   x = 13,168.05