Finding the Fourth Proportional to 39,061.85, 53,905.32 and 21,156.84

Step by Step Solution

1. Step 1: Write the proportion equation
   39,061.85 : 53,905.32 = 21,156.84 : x
2. Step 2: Convert to fraction form
   39,061.85/53,905.32 = 21,156.84/x
3. Step 3: Cross multiply
   39,061.85x = 53,905.32 × 21,156.84
4. Step 4: Simplify right side
   39,061.85x = 1,140,466,230.39
5. Step 5: Solve for x
   x = 1,140,466,230.39/39,061.85
6. Step 6: Final answer
   x = 29,196.43