Finding the Fourth Proportional to 1,992.31, 2,990.63 and 1,687.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,992.31 : 2,990.63 = 1,687.93 : x
2. Step 2: Convert to fraction form
   1,992.31/2,990.63 = 1,687.93/x
3. Step 3: Cross multiply
   1,992.31x = 2,990.63 × 1,687.93
4. Step 4: Simplify right side
   1,992.31x = 5,047,974.10
5. Step 5: Solve for x
   x = 5,047,974.10/1,992.31
6. Step 6: Final answer
   x = 2,533.73