Finding the Fourth Proportional to 39,061.75, 53,905.43 and 21,156.81

Step by Step Solution

1. Step 1: Write the proportion equation
   39,061.75 : 53,905.43 = 21,156.81 : x
2. Step 2: Convert to fraction form
   39,061.75/53,905.43 = 21,156.81/x
3. Step 3: Cross multiply
   39,061.75x = 53,905.43 × 21,156.81
4. Step 4: Simplify right side
   39,061.75x = 1,140,466,940.48
5. Step 5: Solve for x
   x = 1,140,466,940.48/39,061.75
6. Step 6: Final answer
   x = 29,196.51