Finding the Fourth Proportional to 1,870.43, 2,580.15 and 1,187.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,870.43 : 2,580.15 = 1,187.81 : x
2. Step 2: Convert to fraction form
   1,870.43/2,580.15 = 1,187.81/x
3. Step 3: Cross multiply
   1,870.43x = 2,580.15 × 1,187.81
4. Step 4: Simplify right side
   1,870.43x = 3,064,727.97
5. Step 5: Solve for x
   x = 3,064,727.97/1,870.43
6. Step 6: Final answer
   x = 1,638.52