Finding the Fourth Proportional to 1,530.12, 2,112.78 and 999.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.12 : 2,112.78 = 999.37 : x
2. Step 2: Convert to fraction form
   1,530.12/2,112.78 = 999.37/x
3. Step 3: Cross multiply
   1,530.12x = 2,112.78 × 999.37
4. Step 4: Simplify right side
   1,530.12x = 2,111,448.95
5. Step 5: Solve for x
   x = 2,111,448.95/1,530.12
6. Step 6: Final answer
   x = 1,379.92