Finding the Fourth Proportional to 1,939.86, 2,905.29 and 1,116.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,939.86 : 2,905.29 = 1,116.09 : x
2. Step 2: Convert to fraction form
   1,939.86/2,905.29 = 1,116.09/x
3. Step 3: Cross multiply
   1,939.86x = 2,905.29 × 1,116.09
4. Step 4: Simplify right side
   1,939.86x = 3,242,565.12
5. Step 5: Solve for x
   x = 3,242,565.12/1,939.86
6. Step 6: Final answer
   x = 1,671.55