Finding the Fourth Proportional to 3,072.31, 4,608.76 and 991.82

Step by Step Solution

1. Step 1: Write the proportion equation
   3,072.31 : 4,608.76 = 991.82 : x
2. Step 2: Convert to fraction form
   3,072.31/4,608.76 = 991.82/x
3. Step 3: Cross multiply
   3,072.31x = 4,608.76 × 991.82
4. Step 4: Simplify right side
   3,072.31x = 4,571,060.34
5. Step 5: Solve for x
   x = 4,571,060.34/3,072.31
6. Step 6: Final answer
   x = 1,487.83