Finding the Fourth Proportional to 1,858.86, 2,787.04 and 1,116.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,858.86 : 2,787.04 = 1,116.80 : x
2. Step 2: Convert to fraction form
   1,858.86/2,787.04 = 1,116.80/x
3. Step 3: Cross multiply
   1,858.86x = 2,787.04 × 1,116.80
4. Step 4: Simplify right side
   1,858.86x = 3,112,566.27
5. Step 5: Solve for x
   x = 3,112,566.27/1,858.86
6. Step 6: Final answer
   x = 1,674.45