Finding the Fourth Proportional to 1,870.70, 2,808.14 and 1,091.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.70 : 2,808.14 = 1,091.61 : x
2. Step 2: Convert to fraction form
   1,870.70/2,808.14 = 1,091.61/x
3. Step 3: Cross multiply
   1,870.70x = 2,808.14 × 1,091.61
4. Step 4: Simplify right side
   1,870.70x = 3,065,388.25
5. Step 5: Solve for x
   x = 3,065,388.25/1,870.70
6. Step 6: Final answer
   x = 1,638.64