Finding the Fourth Proportional to 38,947.76, 53,747.90 and 21,042.75

Step by Step Solution

1. Step 1: Write the proportion equation
   38,947.76 : 53,747.90 = 21,042.75 : x
2. Step 2: Convert to fraction form
   38,947.76/53,747.90 = 21,042.75/x
3. Step 3: Cross multiply
   38,947.76x = 53,747.90 × 21,042.75
4. Step 4: Simplify right side
   38,947.76x = 1,131,003,517.51
5. Step 5: Solve for x
   x = 1,131,003,517.51/38,947.76
6. Step 6: Final answer
   x = 29,038.99