Finding the Fourth Proportional to 1,030.25, 1,421.55 and 715.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.25 : 1,421.55 = 715.03 : x
2. Step 2: Convert to fraction form
   1,030.25/1,421.55 = 715.03/x
3. Step 3: Cross multiply
   1,030.25x = 1,421.55 × 715.03
4. Step 4: Simplify right side
   1,030.25x = 1,016,447.34
5. Step 5: Solve for x
   x = 1,016,447.34/1,030.25
6. Step 6: Final answer
   x = 986.60