Finding the Fourth Proportional to 285,789.88, 428,685.01 and 72,573.78

Step by Step Solution

1. Step 1: Write the proportion equation
   285,789.88 : 428,685.01 = 72,573.78 : x
2. Step 2: Convert to fraction form
   285,789.88/428,685.01 = 72,573.78/x
3. Step 3: Cross multiply
   285,789.88x = 428,685.01 × 72,573.78
4. Step 4: Simplify right side
   285,789.88x = 31,111,293,439.40
5. Step 5: Solve for x
   x = 31,111,293,439.40/285,789.88
6. Step 6: Final answer
   x = 108,860.72