Finding the Fourth Proportional to 1,388.88, 2,081.40 and 1,354.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.88 : 2,081.40 = 1,354.86 : x
2. Step 2: Convert to fraction form
   1,388.88/2,081.40 = 1,354.86/x
3. Step 3: Cross multiply
   1,388.88x = 2,081.40 × 1,354.86
4. Step 4: Simplify right side
   1,388.88x = 2,820,005.60
5. Step 5: Solve for x
   x = 2,820,005.60/1,388.88
6. Step 6: Final answer
   x = 2,030.42