Finding the Fourth Proportional to 1,089.30, 1,503.05 and 716.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,089.30 : 1,503.05 = 716.43 : x
2. Step 2: Convert to fraction form
   1,089.30/1,503.05 = 716.43/x
3. Step 3: Cross multiply
   1,089.30x = 1,503.05 × 716.43
4. Step 4: Simplify right side
   1,089.30x = 1,076,826.53
5. Step 5: Solve for x
   x = 1,076,826.53/1,089.30
6. Step 6: Final answer
   x = 988.55