Finding the Fourth Proportional to 31,109.72, 42,917.75 and 21,034.52

Step by Step Solution

1. Step 1: Write the proportion equation
   31,109.72 : 42,917.75 = 21,034.52 : x
2. Step 2: Convert to fraction form
   31,109.72/42,917.75 = 21,034.52/x
3. Step 3: Cross multiply
   31,109.72x = 42,917.75 × 21,034.52
4. Step 4: Simplify right side
   31,109.72x = 902,754,056.14
5. Step 5: Solve for x
   x = 902,754,056.14/31,109.72
6. Step 6: Final answer
   x = 29,018.39