Finding the Fourth Proportional to 31,152.34, 42,990.10 and 17,005.20

Step by Step Solution

1. Step 1: Write the proportion equation
   31,152.34 : 42,990.10 = 17,005.20 : x
2. Step 2: Convert to fraction form
   31,152.34/42,990.10 = 17,005.20/x
3. Step 3: Cross multiply
   31,152.34x = 42,990.10 × 17,005.20
4. Step 4: Simplify right side
   31,152.34x = 731,055,248.52
5. Step 5: Solve for x
   x = 731,055,248.52/31,152.34
6. Step 6: Final answer
   x = 23,467.11