Finding the Fourth Proportional to 1,388.67, 2,070.78 and 1,376.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.67 : 2,070.78 = 1,376.37 : x
2. Step 2: Convert to fraction form
   1,388.67/2,070.78 = 1,376.37/x
3. Step 3: Cross multiply
   1,388.67x = 2,070.78 × 1,376.37
4. Step 4: Simplify right side
   1,388.67x = 2,850,159.47
5. Step 5: Solve for x
   x = 2,850,159.47/1,388.67
6. Step 6: Final answer
   x = 2,052.44