Finding the Fourth Proportional to 31,143.76, 42,980.72 and 17,719.36

Step by Step Solution

1. Step 1: Write the proportion equation
   31,143.76 : 42,980.72 = 17,719.36 : x
2. Step 2: Convert to fraction form
   31,143.76/42,980.72 = 17,719.36/x
3. Step 3: Cross multiply
   31,143.76x = 42,980.72 × 17,719.36
4. Step 4: Simplify right side
   31,143.76x = 761,590,654.69
5. Step 5: Solve for x
   x = 761,590,654.69/31,143.76
6. Step 6: Final answer
   x = 24,454.04