Finding the Fourth Proportional to 43,123.47, 64,663.28 and 19,729.86

Step by Step Solution

1. Step 1: Write the proportion equation
   43,123.47 : 64,663.28 = 19,729.86 : x
2. Step 2: Convert to fraction form
   43,123.47/64,663.28 = 19,729.86/x
3. Step 3: Cross multiply
   43,123.47x = 64,663.28 × 19,729.86
4. Step 4: Simplify right side
   43,123.47x = 1,275,797,461.54
5. Step 5: Solve for x
   x = 1,275,797,461.54/43,123.47
6. Step 6: Final answer
   x = 29,584.76