Finding the Fourth Proportional to 1,258.31, 1,887.31 and 477.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,258.31 : 1,887.31 = 477.98 : x
2. Step 2: Convert to fraction form
   1,258.31/1,887.31 = 477.98/x
3. Step 3: Cross multiply
   1,258.31x = 1,887.31 × 477.98
4. Step 4: Simplify right side
   1,258.31x = 902,096.43
5. Step 5: Solve for x
   x = 902,096.43/1,258.31
6. Step 6: Final answer
   x = 716.91