Finding the Fourth Proportional to 1,815.68, 2,719.20 and 992.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,815.68 : 2,719.20 = 992.72 : x
2. Step 2: Convert to fraction form
   1,815.68/2,719.20 = 992.72/x
3. Step 3: Cross multiply
   1,815.68x = 2,719.20 × 992.72
4. Step 4: Simplify right side
   1,815.68x = 2,699,404.22
5. Step 5: Solve for x
   x = 2,699,404.22/1,815.68
6. Step 6: Final answer
   x = 1,486.72