Finding the Fourth Proportional to 42,860.29, 64,285.31 and 11,272.81

Step by Step Solution

1. Step 1: Write the proportion equation
   42,860.29 : 64,285.31 = 11,272.81 : x
2. Step 2: Convert to fraction form
   42,860.29/64,285.31 = 11,272.81/x
3. Step 3: Cross multiply
   42,860.29x = 64,285.31 × 11,272.81
4. Step 4: Simplify right side
   42,860.29x = 724,676,085.42
5. Step 5: Solve for x
   x = 724,676,085.42/42,860.29
6. Step 6: Final answer
   x = 16,907.87