Finding the Fourth Proportional to 39,060.68, 53,903.72 and 21,155.72

Step by Step Solution

1. Step 1: Write the proportion equation
   39,060.68 : 53,903.72 = 21,155.72 : x
2. Step 2: Convert to fraction form
   39,060.68/53,903.72 = 21,155.72/x
3. Step 3: Cross multiply
   39,060.68x = 53,903.72 × 21,155.72
4. Step 4: Simplify right side
   39,060.68x = 1,140,372,007.28
5. Step 5: Solve for x
   x = 1,140,372,007.28/39,060.68
6. Step 6: Final answer
   x = 29,194.88