Finding the Fourth Proportional to 1,523.16, 2,101.98 and 999.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,523.16 : 2,101.98 = 999.18 : x
2. Step 2: Convert to fraction form
   1,523.16/2,101.98 = 999.18/x
3. Step 3: Cross multiply
   1,523.16x = 2,101.98 × 999.18
4. Step 4: Simplify right side
   1,523.16x = 2,100,256.38
5. Step 5: Solve for x
   x = 2,100,256.38/1,523.16
6. Step 6: Final answer
   x = 1,378.88