Finding the Fourth Proportional to 1,030.50, 1,421.49 and 715.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.50 : 1,421.49 = 715.94 : x
2. Step 2: Convert to fraction form
   1,030.50/1,421.49 = 715.94/x
3. Step 3: Cross multiply
   1,030.50x = 1,421.49 × 715.94
4. Step 4: Simplify right side
   1,030.50x = 1,017,701.55
5. Step 5: Solve for x
   x = 1,017,701.55/1,030.50
6. Step 6: Final answer
   x = 987.58