Finding the Fourth Proportional to 1,886.42, 2,602.55 and 1,390.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,886.42 : 2,602.55 = 1,390.25 : x
2. Step 2: Convert to fraction form
   1,886.42/2,602.55 = 1,390.25/x
3. Step 3: Cross multiply
   1,886.42x = 2,602.55 × 1,390.25
4. Step 4: Simplify right side
   1,886.42x = 3,618,195.14
5. Step 5: Solve for x
   x = 3,618,195.14/1,886.42
6. Step 6: Final answer
   x = 1,918.02