Finding the Fourth Proportional to 1,030.47, 1,421.59 and 716.48

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.47 : 1,421.59 = 716.48 : x
2. Step 2: Convert to fraction form
   1,030.47/1,421.59 = 716.48/x
3. Step 3: Cross multiply
   1,030.47x = 1,421.59 × 716.48
4. Step 4: Simplify right side
   1,030.47x = 1,018,540.80
5. Step 5: Solve for x
   x = 1,018,540.80/1,030.47
6. Step 6: Final answer
   x = 988.42