Finding the Fourth Proportional to 1,354.58, 1,870.01 and 857.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,354.58 : 1,870.01 = 857.72 : x
2. Step 2: Convert to fraction form
   1,354.58/1,870.01 = 857.72/x
3. Step 3: Cross multiply
   1,354.58x = 1,870.01 × 857.72
4. Step 4: Simplify right side
   1,354.58x = 1,603,944.98
5. Step 5: Solve for x
   x = 1,603,944.98/1,354.58
6. Step 6: Final answer
   x = 1,184.09