Finding the Fourth Proportional to 28,501.86, 42,748.78 and 9,781.57

Step by Step Solution

1. Step 1: Write the proportion equation
   28,501.86 : 42,748.78 = 9,781.57 : x
2. Step 2: Convert to fraction form
   28,501.86/42,748.78 = 9,781.57/x
3. Step 3: Cross multiply
   28,501.86x = 42,748.78 × 9,781.57
4. Step 4: Simplify right side
   28,501.86x = 418,150,183.98
5. Step 5: Solve for x
   x = 418,150,183.98/28,501.86
6. Step 6: Final answer
   x = 14,670.98