Finding the Fourth Proportional to 1,012.20, 1,402.71 and 992.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.20 : 1,402.71 = 992.76 : x
2. Step 2: Convert to fraction form
   1,012.20/1,402.71 = 992.76/x
3. Step 3: Cross multiply
   1,012.20x = 1,402.71 × 992.76
4. Step 4: Simplify right side
   1,012.20x = 1,392,554.38
5. Step 5: Solve for x
   x = 1,392,554.38/1,012.20
6. Step 6: Final answer
   x = 1,375.77