Finding the Fourth Proportional to 1,522.16, 2,101.49 and 999.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,522.16 : 2,101.49 = 999.10 : x
2. Step 2: Convert to fraction form
   1,522.16/2,101.49 = 999.10/x
3. Step 3: Cross multiply
   1,522.16x = 2,101.49 × 999.10
4. Step 4: Simplify right side
   1,522.16x = 2,099,598.66
5. Step 5: Solve for x
   x = 2,099,598.66/1,522.16
6. Step 6: Final answer
   x = 1,379.35