Finding the Fourth Proportional to 31,093.09, 42,874.58 and 21,004.02

Step by Step Solution

1. Step 1: Write the proportion equation
   31,093.09 : 42,874.58 = 21,004.02 : x
2. Step 2: Convert to fraction form
   31,093.09/42,874.58 = 21,004.02/x
3. Step 3: Cross multiply
   31,093.09x = 42,874.58 × 21,004.02
4. Step 4: Simplify right side
   31,093.09x = 900,538,588.32
5. Step 5: Solve for x
   x = 900,538,588.32/31,093.09
6. Step 6: Final answer
   x = 28,962.66