Finding the Fourth Proportional to 47,796.71, 71,714.64 and 21,128.59

Step by Step Solution

1. Step 1: Write the proportion equation
   47,796.71 : 71,714.64 = 21,128.59 : x
2. Step 2: Convert to fraction form
   47,796.71/71,714.64 = 21,128.59/x
3. Step 3: Cross multiply
   47,796.71x = 71,714.64 × 21,128.59
4. Step 4: Simplify right side
   47,796.71x = 1,515,229,125.50
5. Step 5: Solve for x
   x = 1,515,229,125.50/47,796.71
6. Step 6: Final answer
   x = 31,701.53