Finding the Fourth Proportional to 31,121.79, 42,951.70 and 17,695.06

Step by Step Solution

1. Step 1: Write the proportion equation
   31,121.79 : 42,951.70 = 17,695.06 : x
2. Step 2: Convert to fraction form
   31,121.79/42,951.70 = 17,695.06/x
3. Step 3: Cross multiply
   31,121.79x = 42,951.70 × 17,695.06
4. Step 4: Simplify right side
   31,121.79x = 760,032,823.34
5. Step 5: Solve for x
   x = 760,032,823.34/31,121.79
6. Step 6: Final answer
   x = 24,421.25