Finding the Fourth Proportional to 1,399.98, 2,098.61 and 783.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.98 : 2,098.61 = 783.07 : x
2. Step 2: Convert to fraction form
   1,399.98/2,098.61 = 783.07/x
3. Step 3: Cross multiply
   1,399.98x = 2,098.61 × 783.07
4. Step 4: Simplify right side
   1,399.98x = 1,643,352.31
5. Step 5: Solve for x
   x = 1,643,352.31/1,399.98
6. Step 6: Final answer
   x = 1,173.84