Finding the Fourth Proportional to 28,501.56, 42,756.38 and 8,781.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,501.56 : 42,756.38 = 8,781.72 : x
2. Step 2: Convert to fraction form
   28,501.56/42,756.38 = 8,781.72/x
3. Step 3: Cross multiply
   28,501.56x = 42,756.38 × 8,781.72
4. Step 4: Simplify right side
   28,501.56x = 375,474,557.37
5. Step 5: Solve for x
   x = 375,474,557.37/28,501.56
6. Step 6: Final answer
   x = 13,173.82