Finding the Fourth Proportional to 2,145.93, 3,219.71 and 848.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.93 : 3,219.71 = 848.31 : x
2. Step 2: Convert to fraction form
   2,145.93/3,219.71 = 848.31/x
3. Step 3: Cross multiply
   2,145.93x = 3,219.71 × 848.31
4. Step 4: Simplify right side
   2,145.93x = 2,731,307.95
5. Step 5: Solve for x
   x = 2,731,307.95/2,145.93
6. Step 6: Final answer
   x = 1,272.79