Finding the Fourth Proportional to 1,354.47, 1,868.78 and 856.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,354.47 : 1,868.78 = 856.93 : x
2. Step 2: Convert to fraction form
   1,354.47/1,868.78 = 856.93/x
3. Step 3: Cross multiply
   1,354.47x = 1,868.78 × 856.93
4. Step 4: Simplify right side
   1,354.47x = 1,601,413.65
5. Step 5: Solve for x
   x = 1,601,413.65/1,354.47
6. Step 6: Final answer
   x = 1,182.32