Finding the Fourth Proportional to 1,555.53, 2,146.69 and 856.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.53 : 2,146.69 = 856.91 : x
2. Step 2: Convert to fraction form
   1,555.53/2,146.69 = 856.91/x
3. Step 3: Cross multiply
   1,555.53x = 2,146.69 × 856.91
4. Step 4: Simplify right side
   1,555.53x = 1,839,505.11
5. Step 5: Solve for x
   x = 1,839,505.11/1,555.53
6. Step 6: Final answer
   x = 1,182.56