Finding the Fourth Proportional to 30,665.51, 42,319.60 and 17,236.72

Step by Step Solution

1. Step 1: Write the proportion equation
   30,665.51 : 42,319.60 = 17,236.72 : x
2. Step 2: Convert to fraction form
   30,665.51/42,319.60 = 17,236.72/x
3. Step 3: Cross multiply
   30,665.51x = 42,319.60 × 17,236.72
4. Step 4: Simplify right side
   30,665.51x = 729,451,009.53
5. Step 5: Solve for x
   x = 729,451,009.53/30,665.51
6. Step 6: Final answer
   x = 23,787.35