Finding the Fourth Proportional to 31,139.78, 42,972.66 and 17,711.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,139.78 : 42,972.66 = 17,711.02 : x
2. Step 2: Convert to fraction form
   31,139.78/42,972.66 = 17,711.02/x
3. Step 3: Cross multiply
   31,139.78x = 42,972.66 × 17,711.02
4. Step 4: Simplify right side
   31,139.78x = 761,089,640.71
5. Step 5: Solve for x
   x = 761,089,640.71/31,139.78
6. Step 6: Final answer
   x = 24,441.07