Finding the Fourth Proportional to 1,405.89, 2,106.47 and 993.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.89 : 2,106.47 = 993.13 : x
2. Step 2: Convert to fraction form
   1,405.89/2,106.47 = 993.13/x
3. Step 3: Cross multiply
   1,405.89x = 2,106.47 × 993.13
4. Step 4: Simplify right side
   1,405.89x = 2,091,995.77
5. Step 5: Solve for x
   x = 2,091,995.77/1,405.89
6. Step 6: Final answer
   x = 1,488.02