Finding the Fourth Proportional to 1,071.89, 1,606.76 and 487.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.89 : 1,606.76 = 487.31 : x
2. Step 2: Convert to fraction form
   1,071.89/1,606.76 = 487.31/x
3. Step 3: Cross multiply
   1,071.89x = 1,606.76 × 487.31
4. Step 4: Simplify right side
   1,071.89x = 782,991.80
5. Step 5: Solve for x
   x = 782,991.80/1,071.89
6. Step 6: Final answer
   x = 730.48