Finding the Fourth Proportional to 1,870.62, 2,807.82 and 1,686.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.62 : 2,807.82 = 1,686.75 : x
2. Step 2: Convert to fraction form
   1,870.62/2,807.82 = 1,686.75/x
3. Step 3: Cross multiply
   1,870.62x = 2,807.82 × 1,686.75
4. Step 4: Simplify right side
   1,870.62x = 4,736,090.39
5. Step 5: Solve for x
   x = 4,736,090.39/1,870.62
6. Step 6: Final answer
   x = 2,531.83