Finding the Fourth Proportional to 1,026.72, 1,417.23 and 992.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,026.72 : 1,417.23 = 992.70 : x
2. Step 2: Convert to fraction form
   1,026.72/1,417.23 = 992.70/x
3. Step 3: Cross multiply
   1,026.72x = 1,417.23 × 992.70
4. Step 4: Simplify right side
   1,026.72x = 1,406,884.22
5. Step 5: Solve for x
   x = 1,406,884.22/1,026.72
6. Step 6: Final answer
   x = 1,370.27