Finding the Fourth Proportional to 39,061.25, 53,904.74 and 21,156.31

Step by Step Solution

1. Step 1: Write the proportion equation
   39,061.25 : 53,904.74 = 21,156.31 : x
2. Step 2: Convert to fraction form
   39,061.25/53,904.74 = 21,156.31/x
3. Step 3: Cross multiply
   39,061.25x = 53,904.74 × 21,156.31
4. Step 4: Simplify right side
   39,061.25x = 1,140,425,014.60
5. Step 5: Solve for x
   x = 1,140,425,014.60/39,061.25
6. Step 6: Final answer
   x = 29,195.81