Finding the Fourth Proportional to 31,059.88, 42,811.34 and 21,973.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,059.88 : 42,811.34 = 21,973.50 : x
2. Step 2: Convert to fraction form
   31,059.88/42,811.34 = 21,973.50/x
3. Step 3: Cross multiply
   31,059.88x = 42,811.34 × 21,973.50
4. Step 4: Simplify right side
   31,059.88x = 940,714,869.62
5. Step 5: Solve for x
   x = 940,714,869.62/31,059.88
6. Step 6: Final answer
   x = 30,287.14