Finding the Fourth Proportional to 42,825, 64,238.31 and 11,661.06

Step by Step Solution

1. Step 1: Write the proportion equation
   42,825 : 64,238.31 = 11,661.06 : x
2. Step 2: Convert to fraction form
   42,825/64,238.31 = 11,661.06/x
3. Step 3: Cross multiply
   42,825x = 64,238.31 × 11,661.06
4. Step 4: Simplify right side
   42,825x = 749,086,787.21
5. Step 5: Solve for x
   x = 749,086,787.21/42,825
6. Step 6: Final answer
   x = 17,491.81