Finding the Fourth Proportional to 2,051.56, 2,830.11 and 1,388.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,051.56 : 2,830.11 = 1,388.17 : x
2. Step 2: Convert to fraction form
   2,051.56/2,830.11 = 1,388.17/x
3. Step 3: Cross multiply
   2,051.56x = 2,830.11 × 1,388.17
4. Step 4: Simplify right side
   2,051.56x = 3,928,673.80
5. Step 5: Solve for x
   x = 3,928,673.80/2,051.56
6. Step 6: Final answer
   x = 1,914.97