Finding the Fourth Proportional to 39,061.44, 53,904.78 and 21,156.30

Step by Step Solution

1. Step 1: Write the proportion equation
   39,061.44 : 53,904.78 = 21,156.30 : x
2. Step 2: Convert to fraction form
   39,061.44/53,904.78 = 21,156.30/x
3. Step 3: Cross multiply
   39,061.44x = 53,904.78 × 21,156.30
4. Step 4: Simplify right side
   39,061.44x = 1,140,425,697.11
5. Step 5: Solve for x
   x = 1,140,425,697.11/39,061.44
6. Step 6: Final answer
   x = 29,195.69