Finding the Fourth Proportional to 28,606.72, 42,899.56 and 9,881.96

Step by Step Solution

1. Step 1: Write the proportion equation
   28,606.72 : 42,899.56 = 9,881.96 : x
2. Step 2: Convert to fraction form
   28,606.72/42,899.56 = 9,881.96/x
3. Step 3: Cross multiply
   28,606.72x = 42,899.56 × 9,881.96
4. Step 4: Simplify right side
   28,606.72x = 423,931,735.94
5. Step 5: Solve for x
   x = 423,931,735.94/28,606.72
6. Step 6: Final answer
   x = 14,819.31