Finding the Fourth Proportional to 1,087.70, 1,632.15 and 471.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.70 : 1,632.15 = 471.69 : x
2. Step 2: Convert to fraction form
   1,087.70/1,632.15 = 471.69/x
3. Step 3: Cross multiply
   1,087.70x = 1,632.15 × 471.69
4. Step 4: Simplify right side
   1,087.70x = 769,868.83
5. Step 5: Solve for x
   x = 769,868.83/1,087.70
6. Step 6: Final answer
   x = 707.80