Finding the Fourth Proportional to 1,035.71, 1,428.71 and 656.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,035.71 : 1,428.71 = 656.90 : x
2. Step 2: Convert to fraction form
   1,035.71/1,428.71 = 656.90/x
3. Step 3: Cross multiply
   1,035.71x = 1,428.71 × 656.90
4. Step 4: Simplify right side
   1,035.71x = 938,519.89
5. Step 5: Solve for x
   x = 938,519.89/1,035.71
6. Step 6: Final answer
   x = 906.17