Finding the Fourth Proportional to 31,152.72, 42,990.54 and 17,005.56

Step by Step Solution

1. Step 1: Write the proportion equation
   31,152.72 : 42,990.54 = 17,005.56 : x
2. Step 2: Convert to fraction form
   31,152.72/42,990.54 = 17,005.56/x
3. Step 3: Cross multiply
   31,152.72x = 42,990.54 × 17,005.56
4. Step 4: Simplify right side
   31,152.72x = 731,078,207.40
5. Step 5: Solve for x
   x = 731,078,207.40/31,152.72
6. Step 6: Final answer
   x = 23,467.56