Finding the Fourth Proportional to 1,530.87, 2,111.99 and 999.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.87 : 2,111.99 = 999.58 : x
2. Step 2: Convert to fraction form
   1,530.87/2,111.99 = 999.58/x
3. Step 3: Cross multiply
   1,530.87x = 2,111.99 × 999.58
4. Step 4: Simplify right side
   1,530.87x = 2,111,099.46
5. Step 5: Solve for x
   x = 2,111,099.46/1,530.87
6. Step 6: Final answer
   x = 1,379.02