Finding the Fourth Proportional to 39,026.56, 53,856.72 and 21,121.60

Step by Step Solution

1. Step 1: Write the proportion equation
   39,026.56 : 53,856.72 = 21,121.60 : x
2. Step 2: Convert to fraction form
   39,026.56/53,856.72 = 21,121.60/x
3. Step 3: Cross multiply
   39,026.56x = 53,856.72 × 21,121.60
4. Step 4: Simplify right side
   39,026.56x = 1,137,540,097.15
5. Step 5: Solve for x
   x = 1,137,540,097.15/39,026.56
6. Step 6: Final answer
   x = 29,147.84