Finding the Fourth Proportional to 1,415.33, 1,953.17 and 855.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,415.33 : 1,953.17 = 855.72 : x
2. Step 2: Convert to fraction form
   1,415.33/1,953.17 = 855.72/x
3. Step 3: Cross multiply
   1,415.33x = 1,953.17 × 855.72
4. Step 4: Simplify right side
   1,415.33x = 1,671,368.77
5. Step 5: Solve for x
   x = 1,671,368.77/1,415.33
6. Step 6: Final answer
   x = 1,180.91