Finding the Fourth Proportional to 1,066.20, 1,470.80 and 692.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,066.20 : 1,470.80 = 692.72 : x
2. Step 2: Convert to fraction form
   1,066.20/1,470.80 = 692.72/x
3. Step 3: Cross multiply
   1,066.20x = 1,470.80 × 692.72
4. Step 4: Simplify right side
   1,066.20x = 1,018,852.58
5. Step 5: Solve for x
   x = 1,018,852.58/1,066.20
6. Step 6: Final answer
   x = 955.59