Finding the Fourth Proportional to 2,478.81, 3,719.43 and 1,091.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.81 : 3,719.43 = 1,091.98 : x
2. Step 2: Convert to fraction form
   2,478.81/3,719.43 = 1,091.98/x
3. Step 3: Cross multiply
   2,478.81x = 3,719.43 × 1,091.98
4. Step 4: Simplify right side
   2,478.81x = 4,061,547.82
5. Step 5: Solve for x
   x = 4,061,547.82/2,478.81
6. Step 6: Final answer
   x = 1,638.50