Finding the Fourth Proportional to 1,918.08, 2,870.64 and 1,188.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,918.08 : 2,870.64 = 1,188.27 : x
2. Step 2: Convert to fraction form
   1,918.08/2,870.64 = 1,188.27/x
3. Step 3: Cross multiply
   1,918.08x = 2,870.64 × 1,188.27
4. Step 4: Simplify right side
   1,918.08x = 3,411,095.39
5. Step 5: Solve for x
   x = 3,411,095.39/1,918.08
6. Step 6: Final answer
   x = 1,778.39