Finding the Fourth Proportional to 1,399.83, 2,097.42 and 988.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.83 : 2,097.42 = 988.12 : x
2. Step 2: Convert to fraction form
   1,399.83/2,097.42 = 988.12/x
3. Step 3: Cross multiply
   1,399.83x = 2,097.42 × 988.12
4. Step 4: Simplify right side
   1,399.83x = 2,072,510.24
5. Step 5: Solve for x
   x = 2,072,510.24/1,399.83
6. Step 6: Final answer
   x = 1,480.54