Finding the Fourth Proportional to 1,347.91, 1,860.50 and 788.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,347.91 : 1,860.50 = 788.81 : x
2. Step 2: Convert to fraction form
   1,347.91/1,860.50 = 788.81/x
3. Step 3: Cross multiply
   1,347.91x = 1,860.50 × 788.81
4. Step 4: Simplify right side
   1,347.91x = 1,467,573.67
5. Step 5: Solve for x
   x = 1,467,573.67/1,347.91
6. Step 6: Final answer
   x = 1,088.78