Finding the Fourth Proportional to 1,886.48, 2,603.76 and 1,188.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,886.48 : 2,603.76 = 1,188.80 : x
2. Step 2: Convert to fraction form
   1,886.48/2,603.76 = 1,188.80/x
3. Step 3: Cross multiply
   1,886.48x = 2,603.76 × 1,188.80
4. Step 4: Simplify right side
   1,886.48x = 3,095,349.89
5. Step 5: Solve for x
   x = 3,095,349.89/1,886.48
6. Step 6: Final answer
   x = 1,640.81