Finding the Fourth Proportional to 2,145.78, 3,220.50 and 848.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.78 : 3,220.50 = 848.16 : x
2. Step 2: Convert to fraction form
   2,145.78/3,220.50 = 848.16/x
3. Step 3: Cross multiply
   2,145.78x = 3,220.50 × 848.16
4. Step 4: Simplify right side
   2,145.78x = 2,731,499.28
5. Step 5: Solve for x
   x = 2,731,499.28/2,145.78
6. Step 6: Final answer
   x = 1,272.96