Finding the Fourth Proportional to 1,031.06, 1,421.61 and 716.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,031.06 : 1,421.61 = 716.59 : x
2. Step 2: Convert to fraction form
   1,031.06/1,421.61 = 716.59/x
3. Step 3: Cross multiply
   1,031.06x = 1,421.61 × 716.59
4. Step 4: Simplify right side
   1,031.06x = 1,018,711.51
5. Step 5: Solve for x
   x = 1,018,711.51/1,031.06
6. Step 6: Final answer
   x = 988.02