Finding the Fourth Proportional to 1,066.55, 1,471.30 and 716.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.55 : 1,471.30 = 716.63 : x
2. Step 2: Convert to fraction form
   1,066.55/1,471.30 = 716.63/x
3. Step 3: Cross multiply
   1,066.55x = 1,471.30 × 716.63
4. Step 4: Simplify right side
   1,066.55x = 1,054,368.57
5. Step 5: Solve for x
   x = 1,054,368.57/1,066.55
6. Step 6: Final answer
   x = 988.58