Finding the Fourth Proportional to 2,101.59, 3,151.38 and 785.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.59 : 3,151.38 = 785.55 : x
2. Step 2: Convert to fraction form
   2,101.59/3,151.38 = 785.55/x
3. Step 3: Cross multiply
   2,101.59x = 3,151.38 × 785.55
4. Step 4: Simplify right side
   2,101.59x = 2,475,566.56
5. Step 5: Solve for x
   x = 2,475,566.56/2,101.59
6. Step 6: Final answer
   x = 1,177.95