Finding the Fourth Proportional to 28,499.28, 42,690.60 and 16,776.96

Step by Step Solution

1. Step 1: Write the proportion equation
   28,499.28 : 42,690.60 = 16,776.96 : x
2. Step 2: Convert to fraction form
   28,499.28/42,690.60 = 16,776.96/x
3. Step 3: Cross multiply
   28,499.28x = 42,690.60 × 16,776.96
4. Step 4: Simplify right side
   28,499.28x = 716,218,488.58
5. Step 5: Solve for x
   x = 716,218,488.58/28,499.28
6. Step 6: Final answer
   x = 25,131.11