Finding the Fourth Proportional to 1,620.72, 2,428.68 and 848.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.72 : 2,428.68 = 848.88 : x
2. Step 2: Convert to fraction form
   1,620.72/2,428.68 = 848.88/x
3. Step 3: Cross multiply
   1,620.72x = 2,428.68 × 848.88
4. Step 4: Simplify right side
   1,620.72x = 2,061,657.88
5. Step 5: Solve for x
   x = 2,061,657.88/1,620.72
6. Step 6: Final answer
   x = 1,272.06