Finding the Fourth Proportional to 1,405.86, 1,939.90 and 846.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.86 : 1,939.90 = 846.24 : x
2. Step 2: Convert to fraction form
   1,405.86/1,939.90 = 846.24/x
3. Step 3: Cross multiply
   1,405.86x = 1,939.90 × 846.24
4. Step 4: Simplify right side
   1,405.86x = 1,641,620.98
5. Step 5: Solve for x
   x = 1,641,620.98/1,405.86
6. Step 6: Final answer
   x = 1,167.70