Finding the Fourth Proportional to 38,947.86, 53,747.98 and 21,042.81

Step by Step Solution

1. Step 1: Write the proportion equation
   38,947.86 : 53,747.98 = 21,042.81 : x
2. Step 2: Convert to fraction form
   38,947.86/53,747.98 = 21,042.81/x
3. Step 3: Cross multiply
   38,947.86x = 53,747.98 × 21,042.81
4. Step 4: Simplify right side
   38,947.86x = 1,131,008,531.02
5. Step 5: Solve for x
   x = 1,131,008,531.02/38,947.86
6. Step 6: Final answer
   x = 29,039.04