Finding the Fourth Proportional to 1,375.51, 2,061.25 and 788.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,375.51 : 2,061.25 = 788.71 : x
2. Step 2: Convert to fraction form
   1,375.51/2,061.25 = 788.71/x
3. Step 3: Cross multiply
   1,375.51x = 2,061.25 × 788.71
4. Step 4: Simplify right side
   1,375.51x = 1,625,721.36
5. Step 5: Solve for x
   x = 1,625,721.36/1,375.51
6. Step 6: Final answer
   x = 1,181.91