Finding the Fourth Proportional to 1,662.51, 2,292.80 and 999.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,662.51 : 2,292.80 = 999.12 : x
2. Step 2: Convert to fraction form
   1,662.51/2,292.80 = 999.12/x
3. Step 3: Cross multiply
   1,662.51x = 2,292.80 × 999.12
4. Step 4: Simplify right side
   1,662.51x = 2,290,782.34
5. Step 5: Solve for x
   x = 2,290,782.34/1,662.51
6. Step 6: Final answer
   x = 1,377.91