Finding the Fourth Proportional to 39,061.92, 53,905.32 and 21,156.88

Step by Step Solution

1. Step 1: Write the proportion equation
   39,061.92 : 53,905.32 = 21,156.88 : x
2. Step 2: Convert to fraction form
   39,061.92/53,905.32 = 21,156.88/x
3. Step 3: Cross multiply
   39,061.92x = 53,905.32 × 21,156.88
4. Step 4: Simplify right side
   39,061.92x = 1,140,468,386.60
5. Step 5: Solve for x
   x = 1,140,468,386.60/39,061.92
6. Step 6: Final answer
   x = 29,196.42