Finding the Fourth Proportional to 1,026.90, 1,416.69 and 716.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,026.90 : 1,416.69 = 716.58 : x
2. Step 2: Convert to fraction form
   1,026.90/1,416.69 = 716.58/x
3. Step 3: Cross multiply
   1,026.90x = 1,416.69 × 716.58
4. Step 4: Simplify right side
   1,026.90x = 1,015,171.72
5. Step 5: Solve for x
   x = 1,015,171.72/1,026.90
6. Step 6: Final answer
   x = 988.58