Finding the Fourth Proportional to 1,348.64, 1,860.76 and 788.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,348.64 : 1,860.76 = 788.78 : x
2. Step 2: Convert to fraction form
   1,348.64/1,860.76 = 788.78/x
3. Step 3: Cross multiply
   1,348.64x = 1,860.76 × 788.78
4. Step 4: Simplify right side
   1,348.64x = 1,467,730.27
5. Step 5: Solve for x
   x = 1,467,730.27/1,348.64
6. Step 6: Final answer
   x = 1,088.30