Finding the Fourth Proportional to 28,111.32, 42,162.10 and 10,581.28

Step by Step Solution

1. Step 1: Write the proportion equation
   28,111.32 : 42,162.10 = 10,581.28 : x
2. Step 2: Convert to fraction form
   28,111.32/42,162.10 = 10,581.28/x
3. Step 3: Cross multiply
   28,111.32x = 42,162.10 × 10,581.28
4. Step 4: Simplify right side
   28,111.32x = 446,128,985.49
5. Step 5: Solve for x
   x = 446,128,985.49/28,111.32
6. Step 6: Final answer
   x = 15,870.08